A handheld milk frother is a small handheld device, usually battery-powered, used for frothing milk. Its working part is a whisk tipped with a stainless steel wire spiral. Once turned on, this spiral starts to rotate very rapidly. By immersing the rotating spiral into a liquid, most often milk, air is effectively whipped into it, creating milk foam within a few seconds. This tool is primarily used in households for preparing coffee drinks such as cappuccino or latte. Besides milk, it can also mix cocoa, matcha tea, or protein drinks to ensure no lumps remain. Operation is usually handled by a single button, and cleaning consists of rinsing the spiral under running water.