Support is a price level where a downtrend has repeatedly paused or reversed because buying pressure stepped in. Resistance is the mirror image — a level where an uptrend has repeatedly stalled because selling pressure took over.
These levels aren't exact lines so much as zones — price often reacts a little above or below the "exact" level rather than at the pixel-perfect price. The more times a level has been tested and held, the more traders tend to watch it.
When a support or resistance level finally breaks, it often flips roles — old resistance can become new support, and vice versa. This is one of the most widely used concepts in all of technical analysis because it applies across every timeframe and every market.
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