A favicon is the little image that is shown in a browser's bookmarks, address bar or tabs when displaying pages from a particular site. The default favicon is the favicon.ico file and one is supplied with the SMF installation.
To change which image is used edit /Themes/default/index.template.php as follows:
Find <head> then add after:
echo ' <link rel="shortcut icon" href="favicon.ico" />';
Most modern browsers will pickup that you have a favicon if it is placed on your site or forum root [main directory] without any code edits given that the file is named correctly "favicon.ico"
