What is a Content Delivery Network, or CDN?
CDNs are usually located closer to the person accessing the content to speed things up. As a matter of fact, the CDN does a lot of things to make access faster and take a load off of the server that is presenting the rest of the web page.
They can also balance out the times when a site may be experiencing heavy traffic.
Why does it matter?
With speed being a large determining factor in the success of a website, having pages load quickly is important. For websites that get significant traffic, or for sites with lots of pictures, videos or other large media types, the CDN can help keep visitors around and lower the number of visitors who leave because they had to wait.
Having a content Delivery Network may be an important piece to creating a successful website.