A favicon or “favorite icon” is an icon used when you bookmark a website. Web browsers use them in the URL bar to help identify a website visually.
Creating a Favicon:
A favicon can be created using GIMP. Resize the file to 16×16 and export it as a Window’s icon with an extension of .ico
To prepare the image to be saved as favicon.ico:
1. Make the image square.
2. Resize the image to 16 x 16 pixels.
3. Save the file as favicon.ico
4. Put it in the root directory of your website.
Copy favicon.ico file into your current theme’s main directory.
If the theme has the option in the Settings for “Site Identity”, it must be added there.