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Definition

A swing high is a peak on a chart: a candle whose high sits above the highs of the candles on both sides of it.

Detailed Explanation

A common rule asks for two lower highs on each side, so a swing high can only be confirmed two candles after it prints. That delay matters, because marking a swing too early is how traders talk themselves into a trend that isn't there. In an uptrend each swing high should beat the last one. In a downtrend, a swing high is the natural place for a stop on a short. The rule you pick matters less than using the same one every time, on every chart, so your read of the trend doesn't change with your mood.
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