Crypto Glossary: Beginner Terms Explained Plainly

You do not need to memorise any of this. Read the words you keep running into, skip the rest, and treat this page as a dictionary you return to rather than a chapter you study. We have grouped the terms into four sections so related ideas sit together: the Basics, Wallets & Security, Trading, and the wider Ecosystem & DeFi. Where a term deserves a fuller explanation, we link to one of our longer guides.

The basics

Blockchain

A shared digital record of transactions that many computers keep copies of at once. Because everyone holds the same list and new entries are cryptographically linked to old ones, it is very hard for any single party to quietly rewrite history.

Cryptocurrency

Digital money that lives on a blockchain rather than in a bank's database. No central company issues or controls most cryptocurrencies — see our full explainer for the plain version.

Bitcoin

The first and best-known cryptocurrency, launched in 2009, often used as a store of value or a benchmark for the whole market. We cover it in detail in what is Bitcoin.

Coin

A cryptocurrency that runs on its own independent blockchain, such as Bitcoin on the Bitcoin network or Ether on Ethereum. If it has its own base network, people usually call it a coin.

Token

A cryptocurrency that is built on top of someone else's blockchain rather than running its own. Thousands of tokens live on networks like Ethereum, sharing that network's rules and fees.

Altcoin

A catch-all word for any cryptocurrency that is not Bitcoin. It ranges from large, established projects to tiny, risky ones, so the label alone tells you nothing about quality.

Stablecoin

A token designed to hold a steady value, usually pegged to a currency like the US dollar. People use them to park funds or move money without riding crypto's price swings, though the peg depends on how well the issuer is backed.

Satoshi

The smallest unit of Bitcoin, equal to one hundred-millionth of a coin. It is named after Bitcoin's pseudonymous creator, Satoshi Nakamoto, and lets people deal in tiny amounts.

Fiat

Ordinary government-issued money such as pounds, euros or dollars. In crypto conversations "fiat" simply means the traditional currency you already use every day.

Market cap

The total value of all coins in circulation, found by multiplying the price by the number of coins. It is a rough size gauge — a cheap-looking coin can still have a huge market cap if there are billions of them.

Volatility

How sharply and quickly a price moves up and down. Crypto is famously volatile, which is exactly why you should only ever risk money you can afford to lose.

Halving

A scheduled event on some networks, most famously Bitcoin, where the reward paid to miners is cut in half. It slows the rate at which new coins are created and happens roughly every four years on Bitcoin.

Wallets & security

Wallet

A tool that stores the keys needed to access and move your crypto. It does not literally hold coins; it holds the secret that proves the coins are yours. Our beginners' wallet guide walks through the main types.

Hot wallet

A wallet connected to the internet, such as a phone app or an exchange account. It is convenient for spending and trading but more exposed to hacking than an offline option.

Cold wallet

A wallet kept offline, typically a small hardware device. Because it is not connected to the internet, it is much harder for an attacker to reach, which suits longer-term holdings.

Cold storage

The general practice of keeping crypto keys completely offline for safety. A hardware wallet in a drawer is cold storage; coins sitting on an exchange are not.

Private key

The secret number that lets you spend the crypto at a given address. Anyone who has it controls those funds, so it must never be shared or photographed.

Public key

A shareable identifier, derived from your private key, that others use to send you crypto. Think of it as an account number that is safe to hand out.

Seed phrase

A list of 12 or 24 ordinary words that can restore your entire wallet if your device is lost. Write it on paper, store it offline, and never type it into a website — anyone with these words owns your crypto.

Custodial wallet

A wallet where a company, such as an exchange, holds the private keys on your behalf. It is convenient, but you are trusting that company to keep your funds safe and available.

Non-custodial wallet

A wallet where only you hold the keys and the seed phrase. You get full control and full responsibility — there is no support line to reset a lost seed phrase.

2FA (two-factor authentication)

A second login step on top of your password, usually a code from an app. It means a stolen password alone is not enough to open your account, and an authenticator app is safer than SMS.

Phishing

A scam where fake emails, messages or websites trick you into revealing passwords or your seed phrase. If a message creates urgency and asks for your secrets, treat it as a red flag.

Rug pull

A scam where the people behind a project take investors' money and vanish, leaving a worthless token. New coins with anonymous teams and big promises are the classic setting.

Address

A string of letters and numbers that identifies where crypto is sent or received, a bit like an email address for funds. Always double-check it before sending — transactions cannot be reversed.

Trading

Exchange

A platform where you buy, sell and swap cryptocurrencies. Most beginners start on an exchange because it is the simplest on-ramp — our how to buy crypto guide shows the whole process.

CEX (centralised exchange)

An exchange run by a company that holds your funds and matches your trades, such as the big-name platforms most people first sign up to. Easy to use, but you rely on that company's security and rules.

DEX (decentralised exchange)

An exchange that runs on smart contracts with no central company holding your money; you trade directly from your own wallet. More self-reliant, and usually no sign-up, but also less hand-holding if something goes wrong.

KYC (know your customer)

The identity checks a regulated exchange runs before you can trade, usually a photo ID and a selfie. It is a legal requirement in most countries and cannot normally be skipped on a centralised platform.

Spot

Buying or selling the actual asset for immediate settlement, at the current market price. Spot trading is the straightforward "own the coin" approach, as opposed to leveraged or derivative products.

Market order

An instruction to buy or sell right now at the best available price. It fills fast, but the exact price can differ slightly from what you saw a moment earlier.

Limit order

An instruction to buy or sell only at a price you set or better. It gives you price control but may not fill at all if the market never reaches your number.

Maker fee

The fee charged when your order adds liquidity to the market — typically a limit order that waits on the book. Maker fees are often lower than taker fees to reward providing liquidity.

Taker fee

The fee charged when your order removes liquidity by filling immediately against an existing order. Market orders are usually takers, and taker fees tend to be a touch higher.

Order book

The live list of all the buy and sell orders waiting on an exchange. It shows what people are willing to pay and accept, and where the current price sits between them.

Liquidity

How easily an asset can be bought or sold without moving its price much. High liquidity means smooth trades; low liquidity can mean nasty price jumps on small orders.

Slippage

The gap between the price you expected and the price you actually got. It is more common in fast-moving or thinly-traded markets, and limit orders help you avoid it.

Whale

A person or entity holding a very large amount of a coin. Because their trades can nudge the market, people watch "whale" moves, though following them blindly is risky.

Bull market / bear market

A bull market is a stretch of generally rising prices and optimism; a bear market is a stretch of falling prices and caution. Both are normal parts of the cycle.

ATH (all-time high)

The highest price an asset has ever reached. It is a popular headline number, but a past high tells you nothing reliable about where a price will go next.

DCA (dollar-cost averaging)

Buying a fixed amount at regular intervals rather than all at once, to smooth out the effect of price swings. It is a discipline strategy, not a guarantee of profit.

Ecosystem & DeFi

Gas fee

The fee paid to the network to process your transaction, most commonly discussed on Ethereum. It rises and falls with how busy the network is, so the same action can cost more at peak times.

Mining

The process where computers compete to validate transactions and add new blocks, earning newly created coins as a reward. It secures networks like Bitcoin but uses significant electricity.

Staking

Locking up coins to help secure a network in return for rewards, used by networks that rely on "proof of stake". It can earn a yield, but your coins may be locked and their price can still fall.

Smart contract

A small program stored on a blockchain that runs automatically when its conditions are met. It is the building block behind most tokens, DeFi apps and NFTs.

DeFi (decentralised finance)

Financial services — lending, borrowing, trading — built on smart contracts instead of banks. It can be powerful and open, but bugs, scams and complexity make it higher-risk for beginners.

NFT (non-fungible token)

A token that represents a unique item, such as digital art or a collectible, rather than an interchangeable unit. Each one is one-of-a-kind, which is what "non-fungible" means.

dApp (decentralised application)

An app that runs on a blockchain through smart contracts rather than on a company's private servers. You usually connect your own wallet to use one.

Layer 1

A base blockchain network, such as Bitcoin or Ethereum, that settles transactions itself. Everything else in its ecosystem is built on top of it.

Layer 2

A network built on top of a Layer 1 to make transactions faster and cheaper, then settling back to the main chain. It is a common answer to high gas fees.

Yield farming

Moving crypto between DeFi services to chase the best rewards. Returns can look high, but so can the risks from smart-contract bugs and sudden price moves.

Airdrop

A free distribution of tokens to certain wallets, often to promote a project or reward early users. Beware fake airdrops that ask you to connect a wallet and approve a malicious contract.

Burn

Permanently removing coins from circulation by sending them to an unusable address. Projects sometimes burn tokens to reduce supply, though it does not guarantee a higher price.

Slang worth knowing

HODL

A deliberately misspelt version of "hold", meaning to keep your crypto through the ups and downs rather than trading it. It started as a typo and became a mantra for long-term holders.

FOMO

"Fear of missing out" — the urge to buy something because it is rising fast and you do not want to be left behind. It is one of the most reliable ways to buy at the top, so treat the feeling as a warning.

FUD

"Fear, uncertainty and doubt" — negative talk, sometimes exaggerated, that spooks people into selling. Like FOMO, it is an emotion to notice rather than act on blindly.

On-ramp / off-ramp

An on-ramp is any service that turns fiat money into crypto; an off-ramp turns crypto back into fiat. Exchanges are the most common ramps in both directions.

Ledger

In crypto, "the ledger" is the blockchain's record of who owns what. The word also names a popular brand of hardware wallets, so context tells you which is meant.

Frequently asked questions

Do I need to learn all these terms before I start?

No. Understand a handful — wallet, seed phrase, exchange and volatility will carry you a long way — and look the rest up as they appear. Nobody learns crypto vocabulary all at once.

Which term matters most for staying safe?

Seed phrase. If you understand that your seed phrase controls all your crypto and must be kept offline and private, you have avoided the most common ways beginners lose money to theft.

Why do fees and rules differ so much between platforms?

Availability, fees and features vary by country and change often, because each provider sets its own terms and must follow local regulation. Always verify the current details on the provider's own site before you rely on them.

Remember that this glossary is educational, not advice. Crypto is volatile, you can lose money, and you should only ever risk what you can comfortably afford to lose. When in doubt about a term or a platform, slow down and check a trusted source before acting.