Break of Structure (BOS) in forex trading is a key concept used in price action and market structure analysis. It refers to a situation where the price clearly moves beyond a previous significant high or low, signalling a potential shift or continuation in the market trend. Traders use BOS to identify whether the market is maintaining its current direction or transitioning into a new phase.

In an uptrend, a BOS occurs when the price breaks above a previous higher high. This indicates that buyers remain in control and the bullish trend is likely to continue. Conversely, in a downtrend, a BOS is confirmed when the price breaks below a prior lower low, indicating that sellers remain dominant and bearish momentum persists. These breaks are not just random movements—they reflect strong participation from market players.

BOS helps traders distinguish between trending and ranging markets. When multiple BOS points form in one direction, it strengthens the trend's validity. Many traders combine BOS with other tools such as support and resistance, supply and demand zones, or liquidity concepts to improve accuracy.

It is important to differentiate BOS from a “Change of Character” (ChoCH). While BOS confirms trend continuation, ChoCH typically signals a possible reversal. Proper identification of BOS allows traders to align their trades with market momentum, improving timing and decision-making.

Overall, Break of Structure is a foundational concept for understanding how prices move and how trends develop in the forex market.