Thomas Davis and Ryan Kirkman created cdnjs, Drew Freyling and Peter Dave are maintainers.
How it useful for websites.
The goal of a CDN (Content Delivery Network) is to deliver content easily to end-users with high availability and high performance. CDN improve websites performance when sites use CDN library because websites no need to download again if CDN library already download by other sites.
Example of jquery CDNJS CDN path
jquery – https://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js
Tags: CDN, CDNJS, cloudflare, CSS, JS.