Cup lids are covers designed to fit securely on cups, typically made from materials like plastic, paper, or foam. They serve to prevent spills and keep beverages hot or cold for longer periods. Many cup lids feature a small opening for sipping, making them convenient for on-the-go consumption. These lids are commonly used in coffee shops and fast-food restaurants, where they help maintain the temperature of drinks like coffee and tea. Some lids are designed to be recyclable or compostable, aligning with environmental efforts to reduce waste.