Plastic caps are small, often circular covers made from various types of plastic. They are commonly used to seal containers, such as bottles and jars, to keep their contents fresh and prevent spills. These caps come in different sizes and designs, depending on the type of container they are meant to fit. Many plastic caps are designed with features like tamper-evidence or child-resistance to enhance safety. They are typically made from materials like polypropylene or polyethylene, which are lightweight and durable. After use, plastic caps can be recycled, contributing to efforts in reducing plastic waste and promoting sustainability.