A plunger is a common device that is used to release stoppages in plumbing. The tool consists of a rubber cup with an attached stick "shaft", usually made of wood or plastic. The cup is pushed down against the drain opening, and either pressed hard into the drain to force air in, or is pushed down until the rubber cup is flattened, then pulled out, causing a vacuum that attracts material. The intent is to loosen or break up a clog caused by excessive material in the drain.
The difference between a sink (kitchen) plunger and a toilet plunger is that the former looks like a ball cut in half while the latter looks more like a distorted ball with a large hole on the bottom.
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