How to use Font Awesome Cdnjs?

Cdnjs font awesome is a free, open-source Content Delivery Network for web Fonts, which offers much more performance than Google Hosted Libraries and other free methods of delivering web fonts to your website. You can use it to learn more about tools, compare them and find out which one satisfies your needs. Cdnjs is the best FOSS CDN for the web that you can use in your website or application.

CDN is quite popular in the field of web development to serve various static contents such as CSS, js and img files etc.