A Tweezer Bottom pattern forms on a price chart when two consecutive candlesticks, usually representing two trading sessions, exhibit specific characteristics that suggest a potential reversal in the current downtrend. The pattern typically appears at the end of a prolonged downward movement in the market.

In a Tweezer Bottom formation, the first candlestick is usually a long bearish candle, indicating strong selling pressure and a continuation of the downtrend. Following this, the second candlestick opens lower than the previous close but quickly reverses its direction, forming a long lower shadow or wick. This candle ultimately closes near or above the opening price of the previous candle, forming a small body or even a bullish candle.

The key feature of the Tweezer Bottom pattern is that the second candlestick's low matches or comes very close to the low of the preceding candlestick, creating a 'tweezer-like' appearance with their bottoms at the same level. This equality or proximity of the lows suggests that the selling pressure has diminished, and buyers are stepping in to support the price, potentially signaling a reversal in the downtrend.

Overall, the formation of a Tweezer Bottom pattern signifies a shift in market sentiment from bearish to potentially bullish, with traders interpreting it as a signal to consider long positions or to close out existing short positions.