Most of the times when you're developing a website, you probably want to set an icon for your site like these:

If you want to set an icon like icons above, you must add some lines of codes to your page:
Just place it between <head></head> tags.
<link rel="shortcut icon" href="favicon.ico" />
You can change the favicon.ico to any name else you want, but it's better to leave it alone with the name favicon.ico because firefox and related browsers will change your website icon to the favicon.ico if there was not any <link> in your page.
You can also set a non icon file like .png files as your website's icon:
<head profile="http://www.w3.org/2005/10/profile">
<link rel="icon" type="image/png" href="http://example.com/myicon.png">
</head>
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