Support is a price level where buying tends to halt a decline; resistance is a level where selling tends to cap a rise.
Support and resistance are core technical-analysis tools. Support is a price where past declines tend to stop because buyers step in; resistance is where rallies tend to stall because sellers step in. Traders use them to spot potential entries (near support), targets (near resistance), and stop-loss placement (below support). A break of support on heavy volume is usually a sign of weakness, while a strong break above resistance signals continuation. These levels are zones, not exact numbers — they gain reliability each time price touches and reverses from them.