瀑布指从山壁上或河床突然降落的地方流下的水，远看好像挂着的白布。在地质学上叫跌水，即河水在流经断层、凹陷等地区时垂直地从高空跌落的现象。

A waterfall is the water that suddenly falls from a mountain wall or a riverbed, like a hanging white cloth when looked from afar. Geologically, it is also referred to as cataract. It is the phenomenon of river water dropping vertically from a high altitude as it flows through faults, depressions, etc.