A plain-English trading glossary

Core market and pricing terms

Forex (FX) is the market for trading one currency against another. A currency pair, such as EUR/USD, quotes the value of a base currency in terms of a quote currency. The bid is the price at which you can sell and the ask is the price at which you can buy; the spread is the gap between them and is a cost you pay on every trade.

A pip is the standard smallest increment a pair usually moves in, typically the fourth decimal place of the price, and traders use it to measure movement. Liquidity describes how easily an asset can be bought or sold without moving its price; major pairs are highly liquid, which is part of why their spreads are tight.

Position, size, and leverage terms

A lot is the size of a trade: a standard lot is 100,000 units of the base currency, a mini lot is 10,000, and a micro lot is 1,000. Going long means buying in expectation of a rise; going short means selling in expectation of a fall. Leverage lets you control a position larger than your balance, and margin is the deposit the broker holds to keep that position open.

A margin call is a warning, or an automatic closure, that happens when losses erode your account below the margin the broker requires, which is one reason high leverage is dangerous. Drawdown is the drop from a peak in your account to a subsequent low, and managing it is central to surviving as a trader.

Order, risk, and analysis terms

A stop-loss is an order that closes a trade at a set price to cap a loss, and a take-profit closes it at a set price to lock in a gain. The risk-reward ratio compares the size of the potential loss to the potential gain on a trade. Position sizing is choosing how large a trade to take so the loss, if the stop is hit, stays within your planned risk.

Support is a price area where buying has tended to halt a fall, and resistance is an area where selling has tended to halt a rise. A trend is the general direction of a market over time, up, down, or sideways. A moving average is an indicator that smooths price into a line to show the broader direction. These terms recur across every guide on this site, so it is worth getting comfortable with them early.

Currency pair and quote terms

In any pair, the base currency is the first one listed and the quote currency is the second; the price shows how many units of the quote currency buy one unit of the base. A pair's quote convention also sets where the pip sits, typically the fourth decimal on most pairs and the second decimal on pairs that include the Japanese yen. The majors are the most heavily traded pairs and all include the US dollar, which is part of why they carry the tightest spreads.

Minor pairs, also called crosses, combine two major currencies without the US dollar. Exotic pairs combine a major currency with the currency of a smaller or emerging economy and tend to have wider spreads and thinner liquidity. Going long means buying a pair in the expectation that the base currency will strengthen; going short means selling it in the expectation that the base currency will weaken. Because every pair is two currencies, you are always long one and short the other at the same time.

Cost, execution, and order terms

Beyond the spread, a commission is a separate per-trade fee some brokers charge, often alongside tighter raw spreads. Swap, also called rollover or overnight financing, is the charge or credit applied to a position held past the end of the trading day. Slippage is the difference between the price you expected and the price your order actually filled at, which tends to widen in fast-moving conditions. A requote is when a broker offers a new price instead of filling your order at the one you clicked.

Orders come in a few core types. A market order fills immediately at the best available price. A limit order waits to buy or sell only at a specified price or better. A stop order triggers once price reaches a set level, which is how a stop-loss closes a losing trade automatically. A take-profit closes a winning trade at a predetermined level. Knowing exactly how each order type behaves, and confirming it behaves that way on your broker's platform, prevents nasty surprises at the moment you most need an order to work.

Risk and account terms

Equity is the current value of your account including open profit and loss, while balance is the value excluding trades that are still open. Free margin is the equity not currently tied up holding positions, and the margin level expresses your equity relative to the margin in use. A margin call is the warning, or automatic closure, that occurs when losses erode your account below the margin the broker requires, which is one of the clearest dangers of using too much leverage.

Drawdown is the decline from a peak in your account to a subsequent low, and managing it is central to surviving as a trader because deep drawdowns require disproportionately large gains to recover. Expectancy is the average result you can expect per trade over many trades, combining how often you win with how much you win and lose; it is why an honest educator judges a method by expectancy rather than by a win-rate quoted in isolation. Volatility describes how much and how quickly a price moves, and liquidity describes how easily an asset can be traded without moving its price.

Analysis and market-structure terms

A candlestick shows the open, high, low, and close for a period in a single shape, making momentum and hesitation easy to read at a glance. A timeframe is the slice of time each candle represents, from one minute to one week, and the same market can look different on different timeframes. Fundamental analysis studies the economic and policy forces behind a currency, such as interest rates and inflation, while technical analysis studies price itself through charts, levels, and indicators.

An uptrend is a sequence of higher highs and higher lows; a downtrend is lower highs and lower lows; a range is a sideways market bounded by support and resistance. A breakout is a move beyond a defined level or range, and a false breakout is one that quickly reverses, trapping traders who chased it. The economic calendar lists scheduled releases, such as rate decisions and employment data, that can move markets sharply, which is why even technical traders keep one in view. These structural ideas underpin nearly every strategy, so they are worth learning before any specific setup.

Why the vocabulary matters

It is tempting to skim past definitions and get to the action, but the words are load-bearing. Almost every guide, broker page, and risk rule on this site assumes you know what a pip, a lot, margin, and a stop-loss are, and a single misread term can quietly derail your understanding of an entire concept. Confusing margin with leverage, or a limit order with a stop order, is the kind of small error that turns into a real loss the moment it meets real money.

None of this vocabulary will make you profitable on its own; knowing the words is not the same as having the skill, and no glossary can substitute for risk management, practice, and discipline. But not knowing the words will reliably cost you, because it leaves you unable to follow the very material that builds the skill. Treat this glossary as a reference to return to whenever a term trips you up in another guide, and the rest of the site will read far more clearly. Everything here is educational and is not financial advice.