A favicon (short for favorites icon), also known as a website icon, shortcut icon, url icon, or bookmark icon is an icon associated with a particular website or webpage. 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. Browsers that provide favicon support typically display a page's favicon in the browser's URL bar and next to the page's name in a list of bookmarks. Browsers that support a tabbed document interface typically show a page's favicon next to the page's title. The Microsoft Windows Shell also uses favicons to represent "Internet shortcuts" to web pages.
In much simpler tearm it is a logo in the tabbed view, this adds a glamour point to your blog or site .But the favicons are speciall images not just any images so you have to look up for them online.
In my next post i will tell you guys how to add favicons to your blog or site,till then enjoy and keep checking other post