Would you like to display your own icon on the browser address bar and browser tabs when visitors view your web pages? You can do it using Favicons.
Favicon (pronounced fav-eye-con) is a feature that makes it possible to associate a special logo or other small graphic with a web page. Favicons are used to personalize or brand your web sites.
A favicon (short for favourites icon), also known as a website icon, or  URL icon,  is a 16×16 or 32×32 pixel square icon associated with a particular website or webpage.
Browsers normally show the favicon before the page's title on the tab as well as in the browser's address bar and next to the page's name in a list of bookmarks.
A web designer can create such an icon and install it into a website (or webpage) by several means, and most graphical web browsers will then make use of it. 
The favicon files have the extension .ico. We can even have the animated favicons with the extension .gif.
Microsoft was the first to introduce the favicon in Internet Explorer 4.