A favicon, short for "favorite icon," is a small, square image associated with a website, typically displayed in browser tabs, bookmarks, and address bars. Favicons help users quickly identify and navigate to a website among multiple open tabs or saved bookmarks. Usually sized at 16x16 or 32x32 pixels, favicons are saved in formats like .ico, .png, or .svg and are linked to a website through HTML code in the site's header. They play a subtle but important role in branding and user experience.