The document discusses favicon.ico files, which are small icon files that appear next to website URLs in a browser's address bar and bookmarks. It provides instructions for creating a 16x16 pixel favicon.ico file to represent a website with 16 or fewer colors. It recommends using software that can convert image files into .ico format or is designed specifically for favicon creation. Once created, the favicon.ico file should be uploaded to the website root directory so it can be found by browsers. The document also notes you can create different icon files for specific pages by adding code to the HTML. Using favicons can help brand a site and make it stand out among bookmarks.