A favicon is your website logo that appears next to the meta title on your browser tab.
In other words, instead of showing a blank document icon on the browser, your website will display your official website icon.
Most websites usually use their logo as a favicon. If your website doesn’t have a logo, you can simply create one with the free logo maker. This way, your visitors will easily notice your website when they’re opening a lot of tabs in a single browser window. Plus, your site will look much more professional.
Now, If you Want to include favicon in you site follow the generic html code:
PUBLIC "-//W3C//DTD HTML 4.01//EN"