This is something visual used to represent non-visual concepts or ideas, or is an image that is used to represent a person in the virtual world of the Internet and computers.

This behind-the-scenes video shows a surprising side to how dancing avatars are made. You never know who’s dancing in a motion-capture suit for these dancing avatars. Behind every dancing avatar chick is a dude in khakis with a low latency fiducial mocap suit

Pop legends ABBA are back on the scene, but only in the form of virtual avatars. ABBA worked with an 850-strong team from Industrial Light & Magic, founded by “Star Wars” creator George Lucas, for the project.
Accompanied by a live band, the avatars, or ABBA-tars, perform some 20 songs during the 90-minute show, called “Voyage”. During the show, they made jokes and even had costume changes.
The real ABBA watched among the audience and came on stage at the end, hugging each other and waving to the crowd.