Swimming sounds have become a staple stock effect online because water movement is hard to fake with visuals alone, and a few seconds of splashing instantly tells viewers where a scene is set. Creators reuse short clips like this across edits of pool training, open water swims, beach holidays and animated dives, often trimming the cleanest stroke for a transition. The popularity comes from its versatility, it works as realistic foley for live footage, as a comic cue for a clumsy jump, or as a calm loop under summer montages.