Support and resistance are the most fundamental concepts in all of technical analysis. They are the price areas where the market has made decisions before — where buyers stepped in strongly enough to stop a decline, or where sellers overwhelmed buyers strongly enough to stop an advance. These decisions leave marks on the chart that remain relevant — sometimes for years — because the same price areas that stopped price before will attract attention again when price returns to them.
What Is Support?
Support is a price level or zone where buying pressure has historically exceeded selling pressure — where the market made a decision to go up rather than down. When price returns to a support level, buyers who remember that level tend to buy again. This creates a concentration of demand that can slow or reverse a declining move.
Support is not a magic line where price always bounces. It is a zone of increased probability — price is more likely to react at a previous support level than at a random price. How many times price has bounced from the level in the past, and how clean those bounces were, determines the strength of the support.
On a daily EUR/USD chart: Price fell to 1.0800 in January and bounced strongly. Price returned to 1.0800 in March and bounced again. Price returned to 1.0800 in June. At this point, 1.0800 is established support. Three clean touches with bounces = strong level. Many traders will watch this level for a buying opportunity on the third test.
What Is Resistance?
Resistance is the opposite — a price level where selling pressure has historically exceeded buying pressure. Price approached this level and was rejected — sellers overwhelmed the buyers who were trying to push higher. Like support, resistance is a zone of increased probability where price is more likely to react than at a random level.
Support Becomes Resistance
One of the most powerful and reliable principles in technical analysis is role reversal — when a support level is broken convincingly, it often becomes resistance. And when a resistance level is broken convincingly, it often becomes support.
The logic is rooted in trader psychology. Traders who bought at support and watched price break below it are now sitting in a losing trade. When price rallies back to the broken support level, many of them exit at breakeven — their selling creates resistance at exactly the level that used to be support. The reverse applies to broken resistance.
EUR/USD established strong support at 1.0900 — bounced there twice. Price then broke below 1.0900 with a large bearish candle. Price rallied back toward 1.0900. Former buyers are exiting at breakeven. New shorts are entering at resistance. Result: 1.0900 now acts as resistance.
How to Draw Levels Correctly
Most beginners draw support and resistance lines at price extremes — the exact high or low of a wick. Professional traders draw zones — areas of price that attracted consistent reaction, not a single precise pip.
When drawing a support level, identify the area where multiple candles closed above and then bounced — not necessarily the lowest wick. The zone is more relevant than the exact extreme because price rarely reacts at an identical pip on repeated tests. A zone drawn from roughly the close of the bounce candle to the extreme low of the wick captures the reaction area accurately.
The most common mistake in drawing support and resistance is looking for precision where none exists. Price does not stop at 1.08473 because that is the exact previous low. It reacts in the area of that low because that is where buying pressure previously asserted itself. Draw zones, not lines — and plan your entries and stops accordingly.
Round Numbers and Psychological Levels
Round numbers — 1.1000, 1.0500, 150.00, 1.2500 — attract disproportionate attention from traders. This is not irrational — it reflects the fact that traders globally are watching the same levels, and collective attention creates collective action. Options markets place significant strikes at round numbers. Institutional orders cluster around them. Retail traders set stop losses and take profits at them. This concentration of activity makes round numbers consistently significant as support and resistance.
The most significant round numbers are those ending in 00 — 1.1000, 150.00 — followed by those ending in 50 — 1.0500, 147.50. Always mark these on your chart before you mark any other support or resistance level.