Crypto Glossary for Beginners: 53 Terms Explained Simply (2026)

How to use this glossary#

• Use the Table of Contents sidebar (or scroll) — terms are alphabetical.
• Each heading is a permalink. Bookmark or share …#term-name to land directly on any definition.
• Terms with → See also link out to either a full article or a related term.
• This page is reviewed quarterly. See our editorial standards for how we keep it current.

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A#

Address#

A string of letters and numbers used to receive cryptocurrency — like an email address for crypto. Public and safe to share. Each blockchain has its own address format, so a Bitcoin address won't work on Ethereum.

Airdrop#

Free distribution of a new crypto to existing wallet holders — usually as a marketing push or to reward early users of a protocol. Real airdrops require nothing more than holding a qualifying wallet; "claim" pop-ups that ask you to sign a transaction are often rug pulls or wallet drainers.

Altcoin#

Any cryptocurrency that isn't Bitcoin. Originally meant "alternative to Bitcoin"; today the term covers Ethereum, Solana, Cardano, and thousands of smaller coins. Quality and risk vary enormously across altcoins.

AML#

Anti-Money Laundering — the set of laws and exchange policies that try to prevent crypto being used to launder illegal funds. AML is the reason exchanges ask for ID (KYC), monitor large transactions, and sometimes freeze suspicious accounts.

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B#

Bear market#

A sustained period of falling crypto prices, usually months or longer. The opposite of a bull market. Beginners often enter at the top of a bull market and panic-sell during the following bear market — the most expensive psychological pattern in crypto.

Bitcoin#

The first cryptocurrency, launched in 2009 by the pseudonymous Satoshi Nakamoto. Designed as digital, censorship-resistant money with a fixed supply of 21 million coins. Ticker: BTC. → See also: What is Bitcoin for beginners.

Block#

A batch of recent transactions added to the blockchain at the same time. Bitcoin adds a new block roughly every 10 minutes; Ethereum every 12 seconds. Each block is cryptographically linked to the one before it — change one and every block after it breaks.

Blockchain#

A shared digital record book that thousands of computers keep an identical copy of. Every cryptocurrency runs on one. Once data is added, no single party can secretly change it. → See also: What is blockchain explained simply.

Bull market#

A sustained period of rising crypto prices. Opposite of a bear market. Bull markets feel obvious in hindsight and chaotic while they're happening.

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C#

CEX (Centralized Exchange)#

A crypto trading platform run by a company — like Binance, Coinbase, or Kraken. You create an account, deposit money, and trade. The exchange holds your crypto for you (it's a custodial wallet). Convenient for beginners; trust required. → See also: Binance for beginners.

Cold wallet#

A crypto wallet kept offline — typically a small hardware device like a Ledger or Trezor. Much safer than a hot wallet because the private key never touches an internet-connected computer. Best for amounts you want to hold long-term. → See also: What is a crypto wallet.

Consensus#

The rule a blockchain network agrees on for which new blocks count. Bitcoin uses Proof of Work; Ethereum and most newer chains use Proof of Stake. Consensus is what keeps the network honest without a central authority.

Custodial wallet#

A wallet where someone else (usually an exchange) holds the private key for you. The "wallet" you have on Binance or Coinbase is custodial. Easier than self-custody, but you depend on the custodian's security and solvency. → See also: "not your keys, not your coins".

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D#

DAO#

Decentralized Autonomous Organization — an internet-native group that makes decisions by token holder vote and executes them via smart contracts. Used to manage everything from DeFi protocols to community treasuries. Quality varies; many "DAOs" are mostly decentralized in name.

dApp#

Decentralized Application — software that runs on a blockchain instead of a normal company server. Examples: Uniswap, Aave, OpenSea. You usually connect a wallet instead of creating an account.

DeFi#

Decentralized Finance — financial apps (lending, borrowing, trading, earning yield) built out of smart contracts, with no bank in the middle. Mostly lives on Ethereum and similar chains. Powerful and risky; not where beginners should start.

DEX (Decentralized Exchange)#

A trading venue that runs entirely on smart contracts — no account, no KYC, you trade directly from your own wallet. Examples: Uniswap, PancakeSwap, Raydium. You keep custody; you also bear all the responsibility.

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E#

ERC-20#

The standard for normal tokens on Ethereum — most "altcoins" you've heard of are actually ERC-20 tokens (USDC, UNI, LINK, …). The standard exists so wallets and exchanges only need to support one format to handle thousands of tokens.

Ether (ETH)#

The native coin of the Ethereum network. Used to pay gas fees, to stake, and as the primary trading pair on Ethereum DEXes. People often call the coin "Ethereum" too — both are common.

Ethereum#

The second-largest cryptocurrency by market value, and the most-used smart-contract platform. Launched in 2015. Lets developers build apps directly on the blockchain. → See also: What is Ethereum for beginners.

Exchange#

Any platform where you can buy, sell, or trade crypto. Two flavors: CEX (centralized) and DEX (decentralized). Beginners almost always start on a CEX.

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F#

Fiat#

Government-issued currency — USD, EUR, GBP, JPY, VND, etc. "Fiat onramp" means a service that lets you convert fiat into crypto (and "offramp" goes the other way).

Fork#

A change to a blockchain's rules. A "soft fork" is backward-compatible; a "hard fork" splits the chain into two separate networks. The most famous hard fork was Ethereum splitting into ETH and Ethereum Classic in 2016.

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G#

Gas#

The fee you pay to do anything on Ethereum and similar networks. Paid in ETH and rises when the network is busy. Layer 2 networks like Base or Arbitrum cut gas fees by 10× to 100×.

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H#

Hardware wallet#

A small physical device that stores your private key offline. Examples: Ledger Nano, Trezor, Coldcard. The most secure category of self-custody for most beginners. → See also: What is a crypto wallet.

Hash#

A unique fingerprint of a piece of data, produced by a one-way math function. Change one character in the input and the entire hash changes. Hashes are what link blocks together in a blockchain.

HODL#

Holding crypto long-term instead of trading it. Originated as a typo in a 2013 forum post ("I AM HODLING") and stuck. Often retrofitted to "Hold On for Dear Life."

Hot wallet#

A crypto wallet connected to the internet — typically a mobile or browser-extension wallet like MetaMask, Trust Wallet, or Phantom. Free and convenient; more exposed than a cold wallet. Best for small, active balances.

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K#

KYC#

Know Your Customer — the ID-verification process every regulated exchange runs when you sign up. Driven by AML laws. DEXes don't require KYC because there's no company in the middle to ask.

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L#

Layer 1#

The base blockchain itself — Bitcoin, Ethereum, Solana, Cardano are all Layer 1 networks. Layer 1 provides the underlying security and settlement.

Layer 2#

A network built on top of a Layer 1 to make transactions faster and cheaper while still inheriting the base chain's security. Examples on Ethereum: Base, Arbitrum, Optimism. On Bitcoin: the Lightning Network.

Liquidity pool#

A pile of tokens locked in a smart contract that powers a DEX. Instead of matching individual buyers and sellers, you trade against the pool. Liquidity providers earn fees — but also bear "impermanent loss" risk.

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M#

Market cap#

A crypto's price multiplied by its circulating supply — a rough measure of total value. Bitcoin and Ethereum have market caps in the hundreds of billions; small tokens may have market caps under a million. Be cautious: market cap can be misleading for low-liquidity tokens.

Memecoin#

A cryptocurrency whose value is driven mostly by community and culture, not utility. Examples: Dogecoin, Shiba Inu, Pepe. High-risk, high-volatility category. → See also: Memecoins for beginners 2026.

Mining#

The process of competing to add new blocks to a Proof of Work blockchain. Miners run specialized hardware that races to solve a math puzzle; the winner adds the next block and gets a reward in new coins. Only used on Bitcoin and a handful of other chains today.

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N#

NFT#

Non-Fungible Token — a unique piece of data on a blockchain that proves ownership of a specific item (usually digital art, but also tickets, in-game gear, music, identity). Unlike Bitcoin (where every coin is interchangeable), each NFT is one of a kind.

Node#

A computer running blockchain software — keeping a copy of the ledger, checking new transactions, relaying them to other nodes. The more nodes, the more decentralized and resilient the network.

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P#

Private key#

The secret number that proves you own a crypto address and lets you spend the funds at it. Anyone with your private key can drain your wallet. Self-custody wallets store the private key on your device; seed phrases are the human-readable backup.

Proof of Stake (PoS)#

A consensus mechanism where validators put up coins as a deposit ("stake") for the right to add new blocks. Misbehave and your stake gets slashed. Used by Ethereum, Solana, Cardano. Much more energy-efficient than Proof of Work.

Proof of Work (PoW)#

A consensus mechanism where miners compete by solving math puzzles to add new blocks. First used by Bitcoin; battle-tested but energy-intensive. Most newer chains now use Proof of Stake instead.

Public address#

The "shareable" half of a key pair — what you give people who want to send you crypto. Derived from your private key, but the private key cannot be derived from it. Safe to post publicly.

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R#

Rug pull#

A scam where the team behind a token vanishes with investor funds. Common pattern: launch a flashy token, hype it on social media, drain the liquidity pool, disappear. One of the most frequent ways beginners lose money in DeFi and on small new tokens.

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S#

Satoshi (unit)#

The smallest unit of Bitcoin — one hundred millionth of a BTC (0.00000001 BTC). Named after Bitcoin's pseudonymous creator. You don't have to buy whole Bitcoins; you can buy a few thousand sats.

Seed phrase#

A list of 12 or 24 random English words that backs up your wallet's private keys. Anyone with your seed phrase can take everything. Write it on paper (or metal), store it offline, never type it into a website, never store it as a photo or cloud note.

Slippage#

The difference between the price you expected on a trade and the price you actually got. Common on DEXes, especially for less-liquid tokens. Setting a "max slippage" of 1–2% protects you from getting an unexpectedly bad fill.

Smart contract#

A small program stored on a blockchain that runs exactly the same way every time, for everyone. The building block of DeFi, NFTs, DAOs, and most non-payment crypto apps. Mainly used on Ethereum and similar chains.

Stablecoin#

A crypto designed to hold a stable price — usually pegged 1:1 to a fiat currency. Common examples: USDC, USDT, DAI, all pegged to the US dollar. Used to park value without leaving crypto and as the base trading pair on most exchanges.

Staking#

Locking up crypto you own to help secure a Proof of Stake network — and earning rewards for doing so. Ethereum, Solana, and Cardano all support staking. Typical rewards are 3–7% per year. Not risk-free: validators that misbehave can be slashed.

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T#

Token#

A cryptocurrency built on top of an existing blockchain, rather than having its own. Most "altcoins" are tokens — USDC and UNI are tokens on Ethereum; many memecoins are tokens on Solana. Compare to coin, which usually means the native asset of a blockchain.

Transaction#

Any operation recorded on a blockchain — sending crypto, swapping on a DEX, minting an NFT, interacting with a smart contract. Every transaction has a unique ID (a "tx hash") you can look up on a block explorer.

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V#

Validator#

A computer that helps secure a Proof of Stake network by checking transactions and proposing new blocks. Validators put up a stake; good behavior earns rewards, bad behavior loses some of the stake (slashing).

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W#

Wallet#

Software or a physical device that stores the keys you need to access your crypto. Doesn't actually hold the coins — those live on the blockchain. Core crypto principle: "not your keys, not your coins." → See also: What is a crypto wallet.

Whale#

A holder of a very large amount of a specific crypto. Whales' moves can shift prices meaningfully on smaller coins. On-chain analysts often track whale wallets for signal.

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Y#

Yield farming#

Moving crypto between DeFi protocols to maximize earned rewards. Often involves staking, liquidity pools, and stacking multiple incentives. Returns can be high; so can the risk of smart contract bugs, rug pulls, and impermanent loss.

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How we maintain this glossary#

We add and revise terms as the space evolves. Definitions stay deliberately short — one or two sentences in plain English — so beginners can scan, get oriented, and move on. For deeper coverage, follow the cross-links.

If you spot a missing term or an outdated definition, email hello@eidode.com. We review reader feedback as part of our quarterly refresh.

See our full process on the editorial standards page.

Suggested next reads#

If you read this far, you're ready for the pillar articles:

• What is Bitcoin for beginners — the coin that started it all.
• What is blockchain explained simply — the technology under everything else.
• What is Ethereum for beginners — programmable blockchain, smart contracts, ETH.
• What is a crypto wallet — how your crypto is actually held.
• How to buy crypto step by step — your first hands-on guide.