A Content Delivery Network, or CDN, is a network of strategically located servers that hosts and caches your website’s content. Things like images, movies, and parts of your website’s code can be placed on a CDN to dramatically improve its reliability and performance.
Google, Facebook, Netflix, and just about every major company utilizes CDNs to benefit from their speed and availability. By placing yourself in these ranks, you’re providing your customers with content that loads much faster and is far less likely of having any issues.