Although the name sounds like James Cameron's hit movie about Earth in the distant future, a Gravatar is a great tool that you can use now to brand yourself in our online world. Essentially, your Gravatar is an image that follows you from site to site, appearing beside your name when you leave a comment. Why is this important? Think of your business card. Do you use the plain vanilla design with simple black letters? Or do you ensure that it stands out from the crowd and represents you in a professional way? The same is true for your Gravatar. You don't want to be represented by the same bland default image as thousands of others.