A video that accompanies a music track. Something created to add a more visual aspect to music, and popularized by MTV in the 80s. Some are used to add more meaning to the song and to convey the message better(best type), others are just videos of the artists playing the music(casual and the most popular), and some are random and meaningless things/just straight up weird, sometimes enough weird that it ruins the song in rare cases(Miike Snow). But for the most part, music videos are pretty cool and I'm glad they exist.
Music videos either enhance or diminish the experience of the listener