A breakout happens when an asset's price pushes decisively through a level that had previously contained it, and the move sticks rather than snapping back. The level itself can be a horizontal support or resistance line, the edge of a trading range, a chart pattern boundary such as a triangle or flag, or a trendline that has held for weeks or months. What separates a genuine breakout from ordinary noise is follow-through: the price closes beyond the level, ideally on a higher timeframe, instead of briefly poking through and retreating.
Trading volume is the key filter traders use to judge whether a breakout is real. A move accompanied by volume well above the recent average signals that new capital is committing to the direction of the break, while a breakout on thin volume is a warning sign. Momentum indicators like RSI or MACD, and confirmation across multiple timeframes, are often used alongside volume before a trader commits capital.
Not every breakout holds. A false breakout, sometimes called a fakeout, occurs when price pierces a level just far enough to trigger stop-losses and breakout orders before reversing hard, often catching latecomers on the wrong side. This happens frequently in crypto markets, where thin order books, 24/7 trading, and Bitcoin's outsized influence over altcoins can concentrate stop orders around obvious levels. A common risk-management response is waiting for a retest, where the broken level flips from resistance to support (or vice versa) and holds, before entering a position.