Trading term

What is Support and resistance?

Support is a price level where a falling market tends to stop and bounce because buyers step in; resistance is a level where a rising market tends to stall as sellers take over. Together they mark the floor and ceiling a chart keeps respecting.

Think of support as a floor and resistance as a ceiling. Each time price falls to the support level, enough buyers decide it's cheap and step in, so the decline stalls and price bounces. Each time price climbs to resistance, enough holders decide it's expensive and sell, so the advance stalls and price turns back down. The more times a level is tested and holds, the more traders are watching it — which is part of why it keeps working.

These levels are zones, not exact lines — expect a band a few percent wide rather than a single price. And they aren't permanent. When price finally closes decisively through resistance, that old ceiling often flips into the new floor, and a broken floor becomes the new ceiling — a role reversal traders call polarity. A level only means something once price has actually reacted to it more than once.

A range bouncing between support and resistance
Resistance · $58sellers step in ↓Support · $50buyers step in ↑

Price keeps stalling at $58 (resistance) and bouncing off $50 (support). Notice the wicks poking just through each level — they're zones a few percent wide, not exact lines.

For example

A stock bounces off $50 several times (support) and keeps stalling near $58 (resistance) for weeks. A trader might buy near $50 with a stop just below it, expecting another bounce — and if price instead closes above $58, that old resistance often becomes the new support.

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Why it matters to you

Support and resistance are the foundation almost every other charting tool builds on — trendlines, breakouts, chart patterns and risk placement all reference them. Practically they give you two things: a place to act (lean on support, take profit into resistance) and, more importantly, a place to be wrong. A stop just beyond a level turns a fuzzy hunch into a defined, sized risk.

⚠ A level is a zone, not a laser line

The most common beginner mistake is drawing one exact price and expecting price to reverse to the cent. Real support and resistance are bands — price routinely overshoots by a percent or two, wicks through, and then reverses. Drawing a thin line and getting stopped out by a normal overshoot is exactly how good levels get mistrusted.

Frequently asked questions

What's the difference between support and resistance?

Support is a level below the current price where buyers tend to halt a fall; resistance is a level above it where sellers tend to halt a rise. Same idea, opposite sides — support is the floor, resistance is the ceiling.

How do you identify support and resistance levels?

Look for prices the chart has reversed at more than once: repeated swing lows mark support, repeated swing highs mark resistance. Round numbers, prior breakout points and high-volume prices often line up with them. Treat each as a zone a few percent wide, not an exact line.

What happens when support or resistance breaks?

A decisive close through the level signals the balance between buyers and sellers has shifted. Broken resistance often becomes new support, and broken support becomes new resistance — a flip called polarity, or role reversal. Many traders wait for a 'retest' of the broken level before trusting the move.

Is support and resistance reliable?

They're tendencies, not guarantees — a level holds until it doesn't. Part of why they work is that they're self-fulfilling: because so many traders watch the same obvious levels, orders cluster there. Use them to define where you're wrong, not as certainties.

Related terms

Ascending triangleAn ascending triangle is a bullish continuation pattern: a flat horizontal resistance line on top, with a rising trendline of higher lows beneath it. As the higher lows squeeze price against the ceiling, pressure builds — and it usually resolves with a breakout up through the resistance.ATR (Average True Range)ATR (Average True Range) measures how much a security typically moves in a period — its volatility — as an average of recent trading ranges. It doesn't say which direction price is heading, only how far it tends to travel, which makes it a core tool for stop-losses and position size.Bollinger BandsBollinger Bands wrap a price chart in three lines: a middle moving average with an upper and lower band set two standard deviations away. The bands widen when volatility rises and squeeze together when it falls, framing whether price is relatively high or low.BreakdownA breakdown is when price falls decisively through a support level it had been holding above — the bearish mirror of a breakout. It signals sellers have overwhelmed the buyers defending support, and often triggers a fast move lower as stops and new sellers pile in.
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