What is cdn? What is the principle of CDN?

1, CDN's full name is Content Delivery Network, that is, content delivery network. CDN is an intelligent virtual network built on top of the existing network, relying on the edge servers deployed around the world, through the load balancing, content distribution, scheduling, and other functional modules of the central platform, so that the user can get the content they need in the vicinity of the network to reduce network congestion and improve user access. The key technologies of CDN are content storage and distribution technologies.

2. The basic principle of CDN is to widely use a variety of cache servers, the distribution of these cache servers to the user to visit a relatively centralized region or network, in the user to visit the site, the use of global load technology will be the user's access to the nearest working cache server, the cache server directly respond to user requests.