Traders often talk about liquidity, meaning the volume of orders available to trade against. Price tends to travel toward areas where many orders sit, because that is where large trades can be filled.
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When price reaches a cluster, it can trigger many orders at once, producing a burst of activity. A large participant who needs to buy a lot can do so by pushing into sell stops, which provide the sellers needed to fill the order. That is one reason price sometimes sweeps above a high and then reverses.
This is a mechanism, not a guarantee. Not every sweep reverses, and not every swing level attracts a move.
Understanding it changes how you place orders. If you know stops cluster beyond a recent low, you might avoid placing yours exactly there, or you may wait for a sweep to occur before entering in the opposite direction, with a stop beyond the extreme.
You can also see why breakouts above obvious highs fail so often, since the orders triggered there may be the fuel for a reversal.
The concept is useful as a way of thinking about where orders probably are.
Practical step: mark three recent swing highs or lows, and note what price did when it later moved beyond each.
