Content Delivering Network is a collection of web servers distributed across multiple locations to deliver content more efficiently to users. The server selected for delivering content to a specific user is typically based on a measure of network proximity.
Take for example, a user from south africa, is visiting your website hosted in an US server, it take several seconds for his request to travels to USA server and then receive a response. but with a CDN service, your cache copy of your website is served to the visitor from the CDN server closest to the user/
Most CDN services are quite expensive, don’t be deterred because there are also some very good free content delivery network.
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CloudFlare
CloudFlare protects and accelerates any website online. Once your website is a part of the CloudFlare community, its web traffic is routed through our intelligent global network. We automatically optimize the delivery of your web pages so your visitors get the fastest page load times and best performance. We also block threats and limit abusive bots and crawlers from wasting your bandwidth and server resources. The result: CloudFlare-powered websites see a significant improvement in performance and a decrease in spam and other attacks.
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Incapsula
Through a simple DNS settings change, your website traffic is seamlessly routed through Incapsula’s global network of high-powered servers. Incoming traffic is intelligently profiled in real-time, blocking even the latest web threats. Meanwhile outgoing traffic is accelerated and optimized for faster load times, keeping welcome visitors speeding through. -
Jetpack Photon For WordPress
Photon is an image acceleration and editing service for sites hosted on WordPress.com or on Jetpack-connected WordPress sites. Simply click the “Activate” button for Photon on the Jetpack page in your blog dashboard, and your images will be served dynamically from the global WordPress.com cloud. That means less load on your host and faster images for your readers. -
Coral CDN
CoralCDN is a free and open content distribution network based around peer-to-peer technologies, consisted of a world-wide network of web proxies and nameservers. It allows a user to run a web site that offers high performance and meets huge demand.
Publishing through CoralCDN is as simple as appending a short string “.nyud.net” to the hostname of objects’ URLs; a peer-to-peer DNS layer transparently redirects browsers to participating caching proxies, which in turn cooperate to minimize load on the source web server. It has a WordPress plugin. -
SwarmCDN
SwarmCDN is the first peer-to-peer content delivery network using WebRTC. it provide a seamless (behind the scenes) real-time network of your surfers that serve content to each other (and only each other while they’re on your site). For every image or video that your surfers serve to each other that is content that is not served via your host and therefore save up to 70% of your bandwidth and money.