The Essential Crypto Glossary: 40 Terms Every Trader Should Know

Most crypto glossaries are either too shallow to be useful or too technical to be readable. This one targets the middle: forty terms that come up regularly in crypto trading and that, once understood, unlock most of the rest of the vocabulary.

Market structure terms

Liquidity. The depth of buy and sell orders on an exchange. High liquidity means large orders can be filled without significantly moving the price.

Spread. The difference between the highest bid and the lowest ask. Wider spreads mean higher round-trip trading costs.

Slippage. The difference between the expected price of a trade and the actual fill price, caused by trading through multiple price levels in the order book.

Order book. The list of open buy and sell orders on an exchange, ranked by price.

Market order. An order to buy or sell immediately at the best available price.

Limit order. An order to buy or sell at a specified price or better.

Stop-loss order. A conditional order that becomes a market order when a specific price level is reached, used to limit losses.

OTC. Over-the-counter; trades negotiated directly between two parties rather than executed on a public order book.

Asset and protocol terms

Bitcoin (BTC). The first and largest cryptocurrency by market capitalisation, designed as a peer-to-peer electronic cash system.
 
Ethereum (ETH). The second-largest cryptocurrency, designed as a programmable blockchain that supports smart contracts.
 
Stablecoin. A cryptocurrency designed to maintain a fixed value, usually pegged to a fiat currency like the US dollar.

USDT, USDC. The two largest stablecoins by market capitalisation, both pegged to the US dollar.
 
Altcoin. Any cryptocurrency other than Bitcoin.
 
Token. A cryptocurrency that runs on top of another blockchain, as opposed to a coin that has its own native blockchain.
 
Smart contract. Self-executing code deployed on a blockchain, enabling programmable transactions.
 
Gas. The fee paid to network validators for processing transactions on a blockchain like Ethereum.

Custody and security terms

Wallet. Software or hardware that stores the private keys needed to access cryptocurrency.
 
Private key. The cryptographic key that authorises spending from a wallet. Whoever controls the private key controls the funds.
 
Seed phrase. A human-readable backup of a wallet’s private keys, typically twelve or twenty-four words.
 
Hot wallet. A wallet connected to the internet, convenient but more vulnerable to compromise.
 
Cold wallet. A wallet stored offline, typically on a hardware device, much less vulnerable to remote attack.
 
Self-custody. Holding cryptocurrency in a wallet whose private keys you control, as opposed to leaving funds on an exchange.
 
KYC. Know Your Customer; the identity verification process required by regulated exchanges.
 
AML. Anti-Money Laundering; the regulatory framework that governs financial institutions, including crypto exchanges.

Trading and derivatives terms

Spot. The market for immediate delivery of an asset, as opposed to derivatives.
 
Futures. A contract to buy or sell an asset at a specified future date and price.
 
Perpetual contract. A futures contract with no expiry date, used widely in crypto for leveraged trading.
 
Funding rate. The periodic payment between long and short holders of a perpetual contract, designed to keep its price close to spot.

Open interest. The total number of open derivative contracts on a particular asset.
 
Liquidation. The forced closure of a leveraged position when its margin falls below the maintenance requirement.
 
Leverage. Borrowed capital used to amplify exposure to an asset. Multiplies both gains and losses.
 
Long. A position that profits if the asset’s price rises.
 
Short. A position that profits if the asset’s price falls.

Market behaviour terms

Bull market. A sustained period of rising prices.
 
Bear market. A sustained period of falling prices.
 
Drawdown. The decline from a peak to a subsequent trough, typically expressed as a percentage.
 
Volatility. The magnitude of price fluctuations over a given period.
 
Halving. The Bitcoin protocol’s scheduled reduction of new coin issuance, occurring roughly every four years.
 
Whale. A holder with a position large enough to influence the market through their trading activity.
 
HODL. Long-term holding of an asset through volatility, originally a typo of “hold” that became a community term.
 
DYOR. “Do your own research”; the standard disclaimer attached to crypto commentary.
 
This vocabulary covers the substantive surface area of crypto trading conversation. Once these terms are familiar, the next tier — specific protocols, narratives, and technical concepts — becomes much easier to absorb.