Lids are covers designed to fit over containers, such as pots, jars, or bottles, to protect their contents. They help keep food fresh, prevent spills, and maintain temperature. Lids can be made from various materials, including plastic, glass, and metal, and often come in different shapes and sizes to match the containers they cover. In cooking, lids are essential for pots and pans, as they help retain heat and moisture while food is being prepared. Some lids are designed with vents to allow steam to escape, while others create a tight seal. Proper use of lids can enhance cooking efficiency and improve food storage.