CDN is referred as content network delivery. This is a form of network that is constructed for the fast delivery of data. The network consists of many computers and servers rather than a single central server. All these computers are placed in different corners of network and copies of data are placed on the entire computer. As a result when a user requests a data, it will be delivered from the nearest computer placed at the node.

The major advantage when compared to the conventional network is that the system will not cause any over traffic which can lead to very slow delivery. This situation occurs when all the request get piled up in one single central server. Usually users place request to download many software’s, documents, audio streamed data, applications, real time media stream and many more. This will take some time to complete the entire download process if it is done on a central server network. By using CDN technology, the time taken to deliver data is very small and the clarity of the delivered data will be high even in the remote locations.

Many improvements are made in CDN technology by introducing the system where it is possible to know for user regarding the traffic on any particular node and also to determine the number of visitors by maintaining the log. In CDN system there is no question of network outage. Even if one or more computers are down the data can be obtained from other computers placed on different nodes. On the hand in the centralized system, system outage was a great issue.

There is large number of computers on CDN depending upon the geographical area that should be covered. Certain companies like AT&T is building their own private CDN rather than using the common one. The content delivery can be done either through TCP or UDP connection. If a node is present near the user, then the user will be able to get fast access to the requested information and also there will be no issues regarding the quality and strength.