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A Content Delivery Network (CDN) is a network of servers distributed across multiple geographic locations, designed to efficiently deliver content, such as web pages, images, videos, and other web-based content, to users based on their geographic location. The goal of a CDN is to reduce latency and improve the user experience by serving content from the server closest to the user.

Here's how a CDN works:

  1. A user requests content from a website, such as a web page, image, or video.
  2. The request is redirected to the closest CDN server, based on the user's geographic location.
  3. The CDN server checks its cache to see if it already has a copy of the requested content. If it does, it serves the cached copy to the user.
  4. If the CDN server does not have a cached copy of the content, it retrieves it from the origin server (the server where the website is hosted).
  5. The CDN server caches the content and serves it to the user.
  6. For subsequent requests for the same content, the CDN server will serve the cached copy, reducing the load on the origin server and improving the speed and reliability of the content delivery.

This helps to reduce latency and improve the user experience by serving content from a server that is physically closer to the user. Additionally, by distributing the content across multiple servers, a CDN helps to reduce the load on the origin server and improve the reliability and scalability of the content delivery.

cdn

In this diagram, the user requests content from a website and the request is redirected to the closest CDN server, based on the user's geographic location. The CDN server checks its cache to see if it already has a copy of the content. If it does, it serves the cached copy to the user. If not, it retrieves the content from the origin server and caches it for subsequent requests.

For subsequent requests for the same content, the CDN server serves the cached copy, reducing the load on the origin server and improving the speed and reliability of the content delivery. This helps to provide a fast and consistent user experience, regardless of the user's geographic location.