#AltcoinBreakout refers to a significant price movement where an altcoin (any cryptocurrency other than Bitcoin) breaks through a key technical level, typically a resistance or support level, often accompanied by increased trading volume. This movement signals a potential shift in momentum, indicating the start of a new strong trend, either bullish (upward) or bearish (downward).

Factors confirming a breakout include a strong candle close beyond the broken level, a retest of the area followed by continuation, and supporting signals from technical indicators. #AltcoinBreakout is closely watched by traders as it can precede substantial price rallies, often occurring when capital rotates from Bitcoin into the broader altcoin market.