A bulb holder, also known as a lamp holder or socket, is a device used to hold and connect an electric light bulb to a power source. It is typically made of a heat-resistant material, such as ceramic, plastic, or metal, and has metal contacts that connect to the electrical wiring. Bulb holders come in different types and sizes, with the most common being screw-in and push-in types. The screw-in type has threads on the interior that match those on the base of the light bulb, allowing the bulb to be screwed in place. The push-in type has two pins that fit into the base of the bulb and hold it securely in place. Bulb holders are used in a wide range of applications, including home and commercial lighting fixtures, automotive lighting, and industrial equipment. They are available in different ratings to match the wattage and voltage requirements of different types of light bulbs. Some holders may also include additional features such as switches or dimmers for greater control over the lighting.