A Content Delivery Network (CDN) is a system of distributed servers designed to deliver web content and other web services (like videos, images, scripts, and stylesheets) to users more efficiently and quickly, based on their geographic location. Instead of relying on a single server to deliver content to users from all over the world, a CDN caches content on multiple servers located in various parts of the world (often referred to as edge servers). This helps reduce latency, improve load times, and provide a more reliable browsing experience.

How a CDN Works:
Content Replication: The CDN provider replicates and stores copies of your website or app's content across its network of edge servers.
DNS Routing: When a user makes a request to your website, the Domain Name System (DNS) routes the request to the nearest edge server based on the user's geographic location.
Content Delivery: The CDN edge server delivers the requested content to the user. If the content is cached, it's delivered quickly. If not, the server fetches it from the origin server, caches it for future requests, and sends it to the user.