In technical analysis of financial markets, resistance level refers to a price level at which a security's price has previously struggled to break through, and may therefore face significant selling pressure if it attempts to move higher. Resistance levels are often seen as a psychological barrier for traders and investors, as they may be reluctant to buy or hold the security at prices above the resistance level.

Resistance levels can be identified by charting historical price movements of the security and noting where the price has struggled to break through in the past. They are often used in conjunction with support levels, which are price levels where buying pressure has previously prevented the security from falling further.

Traders and investors may use resistance levels to inform their trading decisions, such as placing sell orders when the security approaches a resistance level. If the security is able to break through a resistance level, it may be seen as a bullish signal and indicate potential for further price increases.