A point or range in a chart that caps an increase in the price of a stock or index over a period of time. An area of resistance, resistance line or resistance level indicates that the stock or index is finding it difficult to break through it, and may head lower shortly. The more times that the stock or index tries unsuccessfully to break through the resistance line, the stronger that area of price resistance becomes.
Resistance and support levels are widely used by experienced traders to formulate trading strategies. For example, if a stock is approaching a very strong resistance level, a trader may prefer to close the position rather than take the risk of a significant decline if the stock uptrend reverses.
