What is an avatar? What advantages does it offer that are lacking in conventional animation clips presented as AVI files?

What will be an ideal response?

An avatar is an icon or character that represents a real person in a virtual word. If represented in an appropriate 3D format, it’s possible to download the geometry defining the figure need be downloaded only once. After that, it requires very little bandwidth to send information about moving the avatar. The bandwidth requirements compare very favorably with conventional animation clips, and offer far greater flexibility in terms of user interactions.