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CDN is short for content delivery network . A content delivery network ( CDN ) is a system of distributed servers (network) that deliver pages and other Web content to a user, based on the geographic locations of the user, the origin of the web page and the content delivery server. A Content Delivery Network (CDN) consists of two components: The Origin Server(s) – where the content to be distributed over Internet is originally stored & Cache Server(s) – where the content is duplicated. There is generally one Origin Server (either in the customer’s data center or in the cloud, with the content delivery network service provider – for example) and many cache servers (in multiple locations across the globe) so that, when a consumer is requesting a particular content on the Internet, it can be served by a cache server nearest to the consumer’s geographical location if the content is available there. Other wise, cache server fetches the content quickly from the origin server after protoc...