A bullish engulfing pattern is when a white, engulfing candlestick follows a black candlestick. A candlestick is a price chart for securities that shows the high, low, opening, and closing prices for a specific period (usually one day). A black candlestick is when a security closes below the opening price and the price at which it previously closed. A white candlestick is when a security closes at a higher level than where it opened. It shows a bullish, or upward, trend.