Content Delivery Network also known as CDN in short is a system of distributed servers or network that deliver web pages and other internet content to a user that is based on the geographic locations of the user, the webpage origins and the content delivery server.
CDN service is effective and efficient in high speed to deliver content of websites speed with high traffic and websites globally. The closer the CDN server links to the user in terms of geographical location, the faster the user will receive the content. Content Delivery Network also provides additional protection from large surges in the network traffic while delivering the website’s content to the targeted user.
CDN has a long process to deliver the web content to the user and it started when the servers which are nearest to the visitor responds to his or her website request for a particular webpage. The content delivery network will copy the pages of the targeted website to a network of servers that are dispersed to different locations online regardless of the geographical locations and cache the contents of the webpage at the same time. In situations when the user requests a webpage that is part of a content delivery network, it will redirect the request from the originating website’s server to another server in the CDN which is nearest to the user and deliver the cached content accordingly. It is to note that Content Delivery Network will also communicate with the originating server to deliver any web content which is previously cached to ensure that the user will get all the necessary information from the web content.
CDN will also try to minimize the distance between the visitors and the hosted website’s server by storing a cached version of the website’s content in multiple geographical locations (also known as points of presence, or PoPs) which the PoP will contain a number of caching servers which is responsible to deliver the content delivery to the targeted visitors within its proximity.
Although the process of bouncing through Content Delivery Network is almost transparent to the user. Users would only know if a CDN has been accessed correctly is to determine that the delivered URL is different than the requested URL.
When CDNs are used to deliver websites to a global audience in large scale, it will tend to reduce latency, increase the site loading times, reducing the bandwidth consumption, secure applications, block data scrappers and other forms of spammers from affecting the user’s server.
Although Content delivery networks are widely used for business interactions and serving the required web content to consumers as fast as possible. Nowadays, CDNs are involved in more aspects of daily life via social media which organizations will use the content delivery network to increase the uploading or downloading of static content, mobile content, dynamic content, e-commerce transactions, video or audio contents, online games and so on.