Avatars are images that members select to represent themselves online. They are shown in profiles and beside every post or personal message. Other members use the avatar to easily identify a member. Commonly avatars are abstract images, photos of celebrities, or pictures of cartoon characters, not a photo of the member.
Administrators use Attachments and Avatars Manager in their Adminstation Center, to can control who can set and change the profile, and whether they can select from a list, upload an image, or link to an offsite avatar. They can set policies on avatar upload file size.