A pin bar is a popular candlestick pattern used in forex trading. It consists of a single candlestick with a long tail (or shadow) and a small body located at the opposite end. The tail represents price rejection and indicates a potential reversal or continuation of the trend. A bullish pin bar forms when the tail is located below the body, suggesting a possible upward price movement. Conversely, a bearish pin bar forms when the tail is above the body, indicating a potential downward price movement. Traders often use pin bars in conjunction with other technical analysis tools to identify key levels of support and resistance and make trading decisions based on price action signals.