Favicon – SEO WIKI
Faviconka (English favicon, short for FAVorites ICON) is a small icon that is displayed in a web browser and serves to designate sites in favorites and tabs.
The favicon can be viewed in the address bar of the browser, next to the address bar (URL), or you can see it in the browser tabs if you added the site you are interested in.
Typically, a favicon is a small .ico 16 by 16 pixel image. In order for the created icon to be displayed in browsers, you should name the favicon.ico file and place it in the root folder of the site.