What is bullish engulfing pattern

Bullish engulfing pattern down trend pe banta ha.es pattern ki nishani ye ha k aehly bearish ki candle bany ge us k bd bullish candle bani ge jo k bearsh candle ko mukammal tor pe cover kry ge aur us se berhi bany ge ye 1 acha pattern ha agr ye down trend pe bany aur market trend mein na ho exastion condition mein ho tb ap entry laen.ap es ye kafi achi moment bhi catch kr sakty haen.