Content delivery networks, or content distribution networks, are groups of data centers and servers that help deliver content to people on the internet based on a visitor's physical location. Imagine you are hosting a site out of Dallas:  Without a CDN, if people from the Netherlands try to access your site, your visitors might have to wait a while for the content of your site to be delivered to them because of the distance. However, if your web hosting service uses a CDN and has a data center in the Netherlands, your visitors from the Netherlands will access a version of your site stored in the much closer data center. This version of your site has some cached files stored in it to boost webpage load times and reduce bandwidth usage. This is good for you since some web hosting services limit bandwidth usage, and faster load times means happier visitors.  According to a study by Digital.com, half of shoppers expect a site to load in three seconds or less, and almost a quarter of shoppers said slow load times are their main source of dissatisfaction when shopping online.