CDN stands for Content Delivery Network. The CDN stores copies of your website content (specifically images, Javascript and CSS files) and delivers it to your readers using a network of servers around the world. This way when readers visit your website data is loaded from the server closest to them. CDNs also tend to have very fast response and loading times with minimal downtime.

If you want to test a CDN to see if it would help your web speeds, checkout our roundup of the best free CDN services for WordPress. It’s a great place to start without having to invest a chunk of change up front.