A favicon (short for favorites icon), also known as a website icon, url icon, shortcut icon, or bookmark icon is a 16×16, 32×32 or 64×64 pixel square icon associated with a particular website or webpage. Blogger use blogger favicon for every blog we create. But we can change it to any our favorite icon.
Blogger default favicon 
In Above image we show you our site favicon that you can see in your browser near of address bar.
So now i think you are understand what is the Favicon.
