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Web hosting is an online service that allows you to publish your website files onto the internet. So, anyone who has access to the internet has access to your website.
A CDN (Content Delivery Network) is a network of servers around the world that stores and delivers your website data. It distributes content from an “origin” server throughout the world by caching content close to where each end user is accessing the internet via a web-enabled device.
Faster performance is the benefit most people think of when considering CDNs, and for good reason. Websites that start using a CDN have seen 50% reductions in load times, or even more in some cases. CDNs speed up content delivery by: - Decreasing the distance between where content is stored and where it needs to go - Reducing file sizes to increase load speed - Optimizing server infrastructure to respond to user requests more quickly
Sometimes, things go wrong on the Internet. Servers go down, networks become congested, and connections get interrupted. A CDN enables web applications to provide uninterrupted service to users even in the face of these problems CDNs balance the load of network traffic, ensuring no one server gets overwhelmed. In the event that a single server stops working, a CDN can initiate a "failover" process that allows a backup server to take over
The main way that CDNs cut down on expenditure for website operators is by reducing trips to and from the origin server through caching. Web hosting providers typically charge websites for the data that gets transferred to and from the web host. The more data that gets transferred, the greater the cost. When a CDN serves most of a website's content on the origin server's behalf, far less data needs to be transferred. Fewer user requests go to the origin server, lowering bandwidth costs.
CDNs are especially well-suited to defending websites from denial-of-service (DoS) and distributed denial-of-service (DDoS) attacks. In these attacks, an attacker directs vast quantities of junk network traffic at a website to try to overwhelm and crash the website. With their many servers, CDNs are better able to absorb large amounts of traffic, even unnatural traffic spikes from a DDoS attack, than a single origin server. By doing so, they keep websites online even when under attack.