what is cdn

What is CDN?

Content delivery networks (CDNs) are the Internet’s transparent backbone for content distribution. Every one of us interacts with CDNs regularly, whether we realize it or not, when reading news stories, making online purchases, watching YouTube videos, or scrolling through social media feeds.


CDNs are likely to be behind every word of text, every image pixel, and every movie frame that is delivered to your PC and mobile browser, regardless of what you do or what type of material you use.

To understand why CDNs are so commonly used, you must first appreciate the problem they were required to solve. Latency is the irritating delay between when you request a web page to be loaded and when its content appears onscreen.


That delay interval is affected by several factors, many being specific to a given web page. However, the delay duration is impacted by the physical distance between you and that website’s hosting server in all cases.

A CDN’s mission is to shorten that physical distance virtually, the goal being to improve site rendering speed and performance.


What is CDN network security?

Cybersecurity is all about controlling access to your protected perimeter from the outside, ideally blocking all threats before they even reach your front door.


A CDN is precisely positioned on the edge of your network to operate as a virtual high-security fence, preventing attacks on your website and web application. Because of its on-edge location, a CDN is suitable for blocking DDoS floods that must be handled outside your main network architecture.