What is a CDN?

Content delivery networks (CDNs) are the Internet’s transparent backbone for content distribution. Every one of us interacts with CDNs on a regular basis, whether we realise it or not, when reading articles on news sites, purchasing online, watching YouTube videos, or scrolling through social media feeds.

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

To understand why CDNs are so popular, you must first understand the problem they were created to solve. Latency is the irritating wait that happens between the time you request a web page being loaded and the time its content appears onscreen.

A lot of factors influence the delay interval, many of which are unique to each web page. The physical distance between you and the website’s hosting server, however, affects the duration of the delay in all circumstances.

The purpose of a CDN is to virtually shorten that physical distance, resulting in faster and more reliable site rendering.

What is a Content Delivery Network (CDN) and How Does It Work?

A CDN caches a cached version of your website’s content in many geographical locations to reduce the distance between users and your website’s server (a.k.a., points of presence, or PoPs). Each PoP has a number of cache servers that are in charge of delivering content to visitors in the area.

In essence, a CDN distributes your material to multiple locations at once, giving your users better coverage. When someone in London visits your US-hosted website, for example, they do so through a local UK PoP. This is far more efficient than having the visitor’s inquiries and your responses travel the length and breadth of the Atlantic.

In a nutshell, this is how a CDN works. Of course, the rabbit hole deepens, since we assumed we’d need an entire book to explain the inner workings of content delivery networks.

Who makes use of a CDN?

Almost all of them. CDNs already provide more than 50% of all traffic today. With each passing year, those figures are constantly increasing.

There are few reasons not to use a CDN if any aspect of your organisation is online, especially since many of them offer their services for free.

CDNs aren’t for everyone, even if they’re free. In particular, if you have a strictly localised website with the vast majority of your users in the same location as your hosting, a CDN will provide little benefit. Using a CDN in this situation can actually degrade your website’s performance by adding another unnecessary connection point between the user and an existing nearby server.

CDNs come in a variety of shapes and sizes

Although CDNs significantly enhance a site’s loading time, they do much more. We’ll go through the many sorts of CDNs and how each one can help your business.


CDNs were created to supplement CSS, JS, HTML, and static material. Once site owners submitted content, they had to send media to these servers in order for them to be updated. Origin pulling was added soon after. This made things a lot easier for these servers because they automatically cached as much data as they could ahead of time. In other words, even if the origin host is down, visitors can still access a site and view its content. This gives the impression that everything is normal and business as usual, even when it isn’t.

Many CDN providers also offer auto-optimization tools, which automatically resize images and save them for later use. For instance, suppose your website uses a 2MB banner picture and a user requests your content on a 300px-wide screen. A CDN can instantly copy your content and deliver a 300px-wide, 30KB-large version. CDNs, of course, are ideal for assisting your mobile visitors.


Because a CDN is the first recipient of traffic and the most remote portion of a site’s system, it may quickly detect DDoS attacks and block them with scrubbers, also known as DDoS defence servers. This is especially useful for websites that store a lot of sensitive data because these types of assaults can be identified earlier without affecting the origin server.

CDNs can also detect spammers, suspicious IP addresses, and various types of crawlers, as well as the actions they intend to perform. If a scraper that already works for Site X is discovered, the same crater will no longer work for Site Y, as long as both sites are managed by the same CDN. These patterns are recognised by traffic filters, which then block any risky activity that have been pre-determined.

What Are CDNs Used For?

While CDNs are beneficial to everybody with a website, they are especially beneficial to businesses who sell internationally. The following are some instances of industries where CDNs are very important:

It doesn’t matter if you run a news site or a pop culture digital paradise if you’re in the publishing or entertainment business. If your website receives a significant amount of traffic, it is your responsibility to provide high-quality information in a timely manner. News sites and digital publishers understand the value of breaking news and providing essays and updates as soon as they become available.

E-commerce — If the primary purpose of your company is to sell things, you know that a website outage is unavoidable. People check and buy products at various times throughout the day, so it’s critical that images load quickly and transactions go smoothly.


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