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- Styles vary widely, but the basic purpose is to hold an incandescent light bulb. Fixtures can be mounted on a stand, on the wall or on the ceiling.
- The basic wall or ceiling fixture mounts onto an electrical box. The most common type of box contains a threaded stud (or threaded rod) that attaches to the fixture with a part called a hickey. Or, instead of a threaded stud, the fixture may use a crossbar hanger.
- Various styles of lights can be used for four basic purposes: task lighting (to illuminate specific areas for activities such as reading or preparing food), ambient lighting (for general illumination of a room), accent lighting (focused, directional light generally on artwork or architectural features), and utility lighting (used to flood an area with light, often outdoors or in work areas).