Light bulbs are the most common type of electric light used in a variety of lighting applications. The name "bulb" is often used generically to refer to an incandescent lamp, which is the type of lamp most people are familiar with. Light bulbs work by heating a fine thread of tungsten to a high temperature. This heating produces light because the filament glows when hot.
Today, the term "lightbulb" is probably used more often to refer to various types of electric lamps in everyday speech, although technically, it is a specific term for incandescent or incandescent lamps.