What is "soundbar"

n. A bar containing multiple speakers that can be mounted under or alongside a television, etc. instead of having separate speakers positioned around the room.

A soundbar, sound bar or media bar is a special loudspeaker enclosure that creates a reasonable stereo effect from a single cabinet. They are much wider than they are tall, partly for acoustical reasons, but also so that they can be mounted above or below a display device e.g. above a computer monitor or under a television or home theater screen.