A breakout in charts occurs when price moves decisively above a resistance line or below a support line, indicating a possible start of a new trend with strong momentum. A valid breakout generally requires high trading volume, sustained candle closing beyond the level, and follow-through price action to confirm strength. On the other hand, a breakout failure happens when price briefly crosses the level but quickly returns inside the range, trapping traders; confirmation of failure comes when candles close back below resistance (in case of upside breakout) or above support (in case of downside breakout), often with weak volume on breakout and strong opposite move afterward. This is why traders wait for closing confirmation and volume support before acting on breakouts.