A breakout occurs when the price decisively moves above a well-defined resistance or trendline, signaling that buying strength has overcome selling pressure and a new upward move may begin; after this breakout, the same trendline often flips its role and starts acting as support, meaning any pullback toward it attracts buyers again. This happens because traders who missed the initial move look to enter on dips, while sellers turn cautious, so the earlier resistance becomes a demand zone. As long as price holds above this trendline support with healthy volume and higher lows, the bullish structure remains intact and the probability of further upside stays strong.