Definition: an icon or figure representing a particular person in a computer game, Internet forum, etc.

"conversation is depicted in a balloon over the avatar's head"

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First and foremost, Avatars are fun to create. They could be a representation of ourselves or some representation of whatever we fancy.

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Secondly, in a world that is obsessed with hiding identity for many reasons on the web, avatars come in handy for virtual identification without using personal photos.

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Finally, introducing Avatars into the classroom can raise student awareness and caution with regards to privacy and security issues on the web.