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Forex, Stock & Crypto Terms Explained

A trading glossary written for investors: the words you meet in share, fund, currency and crypto pages, defined briefly and linked to fuller guides.

Researched and written by the PrymoInvest editorial desk. Updated 26 September 2026. See our research process

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This trading glossary collects the terms used across PrymoInvest. Each definition is kept short; follow the links for the full explanation.

Ask
The lowest price a seller is currently willing to accept. You buy at the ask. See trading fees.
Base currency
The first currency in a pair. In EUR/USD, the euro is the base currency, and the price shows how much of the second currency one unit buys.
Bid
The highest price a buyer is currently offering. You sell at the bid.
Blockchain
A shared ledger, copied across many computers, that records transactions in linked blocks. See how crypto works.
Bond
A loan to a government or company that pays interest and returns the amount borrowed at a set date.
Capital gain
The profit made when an investment is sold for more than it cost. Taxes on gains depend on where you live and the account used.
CFD
Contract for difference: a leveraged contract that pays the change in an asset's price without you owning the asset.
Compounding
Earning returns on earlier returns. Reinvested dividends and low costs help it work over long periods.
Diversification
Spreading money across many holdings so that one failure does less damage.
Dividend
A cash payment from a company's profits to its shareholders.
Dividend yield
The yearly dividend divided by the share price, shown as a percentage.
Earnings per share
A company's profit divided by the number of its shares.
ETF
Exchange-traded fund: a fund whose units trade on an exchange during the session like a share. See how the stock market works.
Ex-dividend date
The date from which a share trades without its next dividend. You must own it before this date to receive the payment.
Expense ratio
A fund's yearly running cost as a percentage of the money invested, also called the ongoing charge.
Free float
The shares available for public trading, excluding large locked-up holdings. Many indices weight companies by free float.
Futures contract
An agreement to buy or sell an asset at a set price on a future date. Index futures trade almost around the clock; see Nasdaq index futures.
Gap
A jump in price between one session's close and the next session's open, usually caused by news while the market was shut.
Halving
The event, roughly every four years, when Bitcoin's block reward is cut in half. See what is Bitcoin.
Index
A number that tracks the value of a basket of shares, such as the S&P 500 or FTSE 100.
Index fund
A fund that aims to match an index by holding its shares or a representative sample.
IPO
Initial public offering: the first sale of a company's shares to the public, when it lists on an exchange.
Leverage
Controlling a position larger than your deposit. It magnifies gains and losses. See the margin calculator.
Limit order
An instruction to buy or sell only at a chosen price or better.
Liquidity
How easily something can be bought or sold without moving its price much.
Lot
A standard trade size in forex: 100,000 units of the base currency. Mini and micro lots are 10,000 and 1,000.
Margin
Money set aside as collateral for a leveraged position.
Market capitalisation
A company's share price multiplied by the number of its shares: the market's value of the whole company.
Market order
An instruction to buy or sell straight away at the best available price.
Nominee account
An account in which a broker holds shares on your behalf, separate from its own assets.
Pip
The standard unit of movement in a currency pair: 0.0001 for most pairs, 0.01 for yen pairs. See the pip calculator.
Price-to-earnings ratio
The share price divided by earnings per share: a rough gauge of how much investors pay for each unit of profit.
Private key
The secret number that proves ownership of crypto and signs transactions. Whoever has it controls the funds.
Screener
A tool that filters a large list of shares or other assets by criteria you choose. See screeners.
Settlement
The final exchange of cash and securities after a trade. US shares settle one business day after the trade.
Spread
The gap between the bid and ask prices, and a cost to anyone who buys and later sells.
Stablecoin
A crypto token that aims to keep a fixed value, usually one US dollar. See what is USDT.
Stop-loss
An order that closes a position once a set price is reached. It limits losses but does not guarantee the exit price.
Withholding tax
Tax deducted at source from dividends or interest before they are paid, often on overseas holdings.