Favicon facts for kids
A favicon is small image (known as an icon) that is used to identify a website or webpage.
This type of icon (also known as a favorite icon or favorites icon) is usually only 16 pixels in height and 16 pixels in width. And when a favicon is included in a webpage it can be seen next to a browser's address bar, inside a browser's tab or in the browser's Favorites' or Bookmarks' list.
Images for kids
Wikipedia's favicon, shown in an older version of Firefox (from 2008)
Favicon Facts for Kids. Kiddle Encyclopedia.