The purpose of a music video is to promote an artist/band for their new music. It provides a visual representation for them. It is a great way for other people around the world to listen to their music. Viewers generally remember a song if it has a music video, and most songs in the charts will have a music video because people like the songs better. When a video becomes popular, people remember the artist because of the video. The artist will generally stay in the charts and public eye the more they put music videos out there.
Example:
Cody Simpson rose to fame after his music video of "iYiYi" featuring American Rapper, Flo Rida.
Example:
Cody Simpson rose to fame after his music video of "iYiYi" featuring American Rapper, Flo Rida.
Now 5 years later, he is still making music videos because it promotes him as an artist.