A doji is the visual signature of a stalemate. The candle opens at one price, swings around during the time window, and closes at almost exactly the same place it opened. The body is reduced to a thin horizontal line; the wicks can be short or dramatic, but the body itself is essentially flat.
The trader''s read is indecision. Whatever pressure was pushing price in one direction during the session was exactly cancelled by pressure in the other direction. After a sustained move, a doji marks the spot where momentum stalled — not where it reversed, but where it paused enough to be visible.
There are sub-types worth knowing: a long-legged doji has long wicks on both sides (price travelled, but went nowhere); a dragonfly doji has a long lower wick and almost no upper wick (sellers tested down, buyers rejected); a gravestone doji has a long upper wick and almost no lower wick (buyers tested up, sellers rejected). The shape of the wicks matters because it tells you which side blinked.
Context is everything. A doji at the top of an extended rally, near a known resistance level, after several strong green candles, is a far stronger signal than a doji that prints inside an existing range. The doji itself doesn''t predict direction; it tells you that the trend that produced the prior candles has run out of conviction. The next candle decides whether that pause becomes a reversal or just a breather.
Doji-as-signal works best paired with confirmation: a close back through the doji''s open price in the opposite direction of the prior trend, or a structural break (e.g. through the closest swing low or high).