A keycap is the top part of a key on a keyboard, which is typically made of plastic. It is designed to provide a surface for users to press when typing or using a computer. Keycaps come in various shapes, sizes, and colors, allowing for customization and personalization of keyboards. They can be found on different types of keyboards, including mechanical, membrane, and laptop keyboards. Keycaps are often labeled with letters, numbers, or symbols that represent their function. In the world of mechanical keyboards, enthusiasts often replace standard keycaps with custom ones to enhance aesthetics or improve typing experience. The material and profile of keycaps can also affect the feel and sound of typing.