The ICO file format is an image file format for computer icons in Microsoft Windows. ICO files contain one or more small images at multiple sizes and color depths, such that they may be scaled appropriately.
In respect to this, what is the use of favicon ICO?
A favicon /ˈfæv.?ˌk?n/ (short for favorite icon), also known as a shortcut icon, website icon, tab icon, URL icon, or bookmark icon, is a file containing one or more small icons, associated with a particular website or web page.
What is a browser favicon?
A favicon is the little icon that browsers display next to a page's title on a browser tab, or in the address bar next to its URL. It also is used when you bookmark a page. Here are some examples: Here's an example of the bookmarks menu: But it doesn't stop there.
What is the size of a favicon?
The format for the image you have chosen must be 16x16 pixels or 32x32 pixels, using either 8-bit or 24-bit colors. The format of the image must be one of PNG (a W3C standard), GIF, or ICO. w3c.org: How to Add a Favicon to your Site (Draft in development).