An E27 filament bulb holder is a type of socket that is designed to hold and connect an E27 base bulb. The E27 designation refers to the type of bulb base, which has a diameter of 27 millimeters.

The filament bulb holder is typically made of a heat-resistant material such as porcelain or plastic and has two or three screw terminals for connecting the wires. The wires are typically connected to a power source such as a wall outlet or switch, and the bulb is screwed into the holder.

Filament bulbs are incandescent bulbs that use a filament made of tungsten wire to produce light. They are commonly used in home and commercial lighting applications due to their warm color temperature and high color rendering index.

The E27 filament bulb holder is a popular choice for decorative lighting fixtures, such as chandeliers, pendant lights, and wall sconces, as well as for general-purpose lighting applications. It is a widely used and standardized socket type that is compatible with a wide range of bulb brands and types.