Simplify the following text for a Grade 10 native English-speaking person.
Original: A favicon ( short for favorites icon ) , also known as a shortcut icon , website icon , URL icon , or bookmark icon is a file containing one or more small icons , most commonly 16x16 pixels , associated with a particular website or webpage .
Simplified: 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 .