There's two candle formation. If this one is the first candle, this is the second candle. So for the first candle you can see the opening price is here and the sellers to control and drive the price down lower, closing near the lows of the day. That's what happened on the first day, second day.

What happens that the market opened at this price point and the buyers pushed the price up higher, closing near the highs of the day. So there's this sudden turn of events right where the sellers on the first day they thought they've won the battle, but only to see the next day the buyers step in and push the price of higher closing near the highs of the day. So this is what we call a bullish engulfing pattern.