An avatar is a graphical representation of a user in the system - for instance, the author avatar right above this paragraph.  Avatars are more than just eye candy, although they are appealing to look at. Avatars help us quickly associate data to a specific person. If you are an existing Gravatar user, updating your avatar is easy. In fact, it may have already been automatically done for you when your user was created.
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Gravatar is an online service that allows you to pick an avatar once and associate it with your email address. Then, no matter what system or platform you are on, as long as they support Gravatar, avatar updates are super easy, or even automatic. See gravatar.com for more info.

To update your profile avatar from Gravatar, log in to the web app. Then on the top right, click your user name > My Profile. Once you’re in your profile, simply click the Update from Gravatar button. That’s it!