What is plastic bottle cap？

A plastic bottle cap is a small, typically circular, lid that is used to close the opening of a plastic bottle. The primary function of a plastic bottle cap is to keep the contents inside the bottle fresh and prevent spills or leaks. Plastic bottle caps come in various sizes and designs to fit different types of bottles, and they can be attached to the bottle using various methods such as screw-on, snap-on, or press-on.