What is CDN and how it works ?

CDN (content delivery network) is a geographically distributed servers to provide the internet contents such as images, videos, files, anything to the end users in a quick interval of time (simply caches and delivers these files from their nearest location to the end users), CDN gained immense popularity for the last couple of years, because of its fast delivery time and security.
The transfer of request will take more time if a user in India sends a request to the website whose server is located in the US.

Whereas, the same user can retrieve the information faster with the CDN PoP is in India itself.

Content delivery networks (CDN) are the transparent backbone of the Internet in charge of content delivery.
To minimize the distance between the visitors and your website's server, a CDN stores a cached version of its content in multiple geographical locations (a.k.a., points of presence, or PoPs). Each PoP contains a number of caching servers responsible for content delivery to visitors within its proximity.

To minimize the distance between the visitors and your website's server, a CDN stores a cached version of its content in multiple geographical locations.

CDN, it stands for Content Delivery Network. A content delivery network or content distribution network (CDN) is a globally distributed network of proxy servers deployed in multiple data centers

A content delivery network (CDN) refers to a geographically distributed group of servers which work together to provide fast delivery of Internet content. A CDN allows for the quick transfer of assets needed for loading Internet content including HTML pages, javascript files, stylesheets, images, and videos.

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 webpage and the content delivery server.

A content delivery network or content distribution network (CDN) is a geographically distributed network of proxy servers and their data centers

A content delivery network (CDN) refers to a geographically distributed group of servers which work together to provide fast delivery of Internet content. A CDN allows for the quick transfer of assets needed for loading Internet content including HTML pages, javascript files, stylesheets, images, and videos.

A content delivery network (CDN) is a server that delivers fast Internet content at once. A CDN lets you quickly transfer the resources needed to load HTML content, JavaScript files, stylesheets, images, videos, etc