CDN stands for "content delivery network". The network consists of servers distributed across continents. Its primary role is to deliver online content to end-users. Once a user sends a request, the content delivery network caches it and serves the user with content from the nearest server. The content doesn’t only include videos and images but also HTML, JS, and CSS code. The ultimate purpose of a CDN is to reduce DNS response and wait times and to increase web page loading speed.