One of the oldest website features is the favicon. This image represents your website in the browser tab, in bookmarks, and on mobile browsers.
Since the resolution of touch screens is improving, you need more pixels for your favicon to get a sharp image.
By using a favicon generator, you can create favicons for a lot of different sizes. However, you still have to provide the artwork for the broadest possible dimension, and you have to fiddle the result into your website code.
There is a striking similarity between the favicon and your logo on social media.
With 1der1, just drag your social media logo into your 1der1 page. This way you have no extra design work. You can use your social media logo as a page logo as well. This way, you can spare extra loading time even for the best favicon resolution.