Generally, soundbars are a single long speaker with several drivers inside but some come with external subwoofers for extra low-end extension and rear speakers for surround sound effects whereas others are compatible with other speakers from within the manufacturer's brand. If floor-shaking bass is high on your priority list then these are models you'll want to consider.
Most modern Bluetooth speaker bar have some options for wireless music playback with wifi streaming via services such as Airplay 2, Spotify Connect and Chromecast, as well as Bluetooth connectivity. Some also have microphones with voice assistant functionality or compatibility. If you have external devices such as games consoles or a 4K Blu-ray player, keep an eye out for additional HDMI passthrough ports that could make your setup more flexible.
Soundbars on Nashinal soundbar speaker supplier were primarily designed to generate strong sound with good bass response. Soundbar usage has increased steadily as the world has moved to flat-screen displays. Soundbars are relatively small and can be easily positioned under a display, are easy to set up, and are usually less expensive than other stereo sound systems.