According to the Gravatar site, your Gravatar (or Globally Recognized Avatar) is an image that follows you from site to site appearing beside your name when you do things like comment or post on a blog.
Simply put, a Gravatar is your online image or logo associated with your email address.
You create your profile, upload your photo, and then when you participate in any Gravatar-enabled site (like WordPress), your Gravatar image will automatically appear.
A Gravatar is a free service for site owners and users, and puts a face to your brand to helps you stand out.
To get a Gravatar you just open a free account by going to Gravatar.com.
Once you click on the Create Your Own Gravatar button, you’ll be taken to a sign up page where you can fill in your information – email address, username and password.
An email will be sent to activate your account. Click on the link in the email and sign in to your Gravatar account.
You're signing up for a WordPress.com account too, but don't worry ... I don’t use my WordPress.com account and they don't send me any unsolicited email.
After signing in you’ll go to Managing Gravatars. Here you can:
And you're done!
Then anytime you comment on someone’s WordPress website or have an author box on your own, it shows up automatically!
It’s simple and it’s free. Go to Gravatar’s website and signup for a free account. Add an avatar of yourself. This could be a picture of yourself, your company’s logo, or something unique. You can change it at any time.