Favicon
A favicon is a small image that is used on a website to identify the website in the browser, bookmark menu, and other platforms. Favicons are usually saved in ICO or PNG format and have a size of 16×16 or 32×32 pixels. They're often used as a small version of a website's logo or brand and can be displayed in the address bar, in the bookmark menu, or next to the page heading. Favicons are an important element of website identity and can help make the website easier for users to recognize and differentiate. Using favicons is optional, but it is recommended that you use them on websites to improve the user experience.