Adding a favicon is to your website is easy to do. Many times, though, all the browsers do not see it.
Put the favicon.ico in the root directory. Add the following between the head tags:
<link rel="icon" type="image/ico" href="favicon.ico"> <!--[if IE]> <link rel="shortcut icon" href="/favicon.ico" type="image/vnd.microsoft.icon"> <![endif]-->
Using both of these statements insures the icon shows up in all browsers.
The original Microsoft specification used "shortcut icon"
which does not conform to the rel attribute.
If the favicon does not show up in your browser, try these tips: