Bullish engulfing candles indicate immense buying interest that swallows the range of the prior candlestick low and surpasses the candlestick highs. The buying action is frenzied as the candle usually closes at its highs with little to no upper wick. This in turn triggers more buyers who spill over into the next candle. If the next candle closes higher than the bullish engulfing pattern, the next leg of the uptrend usually forms. investopedia.com/terms/b/bullishengulfingpattern.asp