A Content Delivery Network is basically a critical part of almost any modern web application. It has been used as CDN simply improved the delivery of content by replicating the commonly requested files across a globally distributed set of caching servers. Meanwhile, CDNs have already become much more useful over the time. A CDN will definitely reduce the load on an application origin for caching and for improving the required experience of the requestor by delivering the local copy of the definite content from a nearby cache edge, or Point of Presence (PoP). Basically, CDN is taking proper care of the heavy lifting as the application origin is off the hook for opening the connection.
It is a system of distributed servers (network) that is delivering the pages and other web contents to the user. It is the transparent backbone of the Internet in charge of content delivery. It is mainly based on the geographical locations of the user, the origin of the webpage and their content delivery server.
This service is highly effective in speeding the delivery of the content of any websites with high traffic. The websites generally have a global reach and working efficiently and effectively. While reading articles on the news sites, watching YouTube and shopping online, every person generally interacts with CDNs on their daily basis.
No matter what we do or what type of content we are consuming, chances are that people will find CDNs behind every movie frame, every character of text, every image pixel which are delivered to Personal Computer and mobile browser.
For minimizing the distance between visitors and their website's server, a CDN stores a cached version of its content in different geographical locations. Every PoP contains a lot of caching servers responsible for different content delivery to the visitors within its proximity.
CDN basically puts the content in different multiple places at once, providing the superior coverage to their users. Well, if someone accesses a US-hosted website, then is done through a local UK PoP, which is quicker than the visitor's requests and their responses.
In today's world, half of all traffic is served by the CDNs. Basically, those numbers are rapidly growing with every passing year. The main reality is that the main part of the business is online, there are a lot of reasons not to use a CDN especially when there are a lot of offers and services available at free of charge.
CDN is not for everyone if you are running a strictly localized website, with a vast majority of the users which is located in the same region as hosting then it is quite helpful. Well, the website's performance can be worsened with the use of CDN by introducing another unessential connection point between the visitor and an already nearby server.
CDN Illustration by https://mywebheads.com