A bullish engulfing pattern is a strong reversal signal that forms when a large bullish candle completely engulfs the body of the previous bearish candle, showing a clear shift from selling pressure to buying dominance. It usually appears after a down move or near key support levels, indicating that buyers have taken control and may push prices higher. The pattern becomes more reliable when it forms at support, trendline support, or after a brief pullback within an uptrend, especially if followed by increased volume or a strong follow-through candle.