What is a Favicon? 

A favicon pron.: /ˈfævɪkɒn/ (short for Favorite icon), also known as a shortcut icon, Web site icon, URL icon, or bookmark icon, is a file containing one or more^[1] small icons, most commonly 16×16 pixels, associated with a particular Web site or Web page.

See the image below 

You can create your own favicon easily by following the tutorial in our Knowledge Base.