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(Content Delivery Network) A distribution system on the Internet that accelerates the delivery of Web pages, audio, video and other Internet-based content to users around the world. The CDN replicates the content provider's files in servers, called "caching servers" or "edge servers," located in geographically dispersed datacenters. Most CDNs are third-party services; however, large companies may develop their own "enterprise CDN" (eCDN) to support remote locations more effectively.

When content is replicated throughout the country or the world, it is delivered to users with greater speed and reliability. The CDN network routes the user's request for content to the appropriate caching server based on the user's location. CDNs are often connected to multiple ISP backbones and have peering relationships with others, providing high availability to users.

Types of Services

Web Acceleration
Every CDN accelerates content delivery by nature of its multiple backbones (in most cases) and numerous caching servers. A CDN may also augment acceleration via compression between nodes in its own network. Quite often, only the graphics on a Web page are delivered by the CDN, while the HTML text is sent out from the customer's servers.

Streaming and Downloading
Video uses extensive network bandwidth, and many customers of a CDN use the service solely to stream video to users. A CDN may offer several streaming methods including Flash, Windows Media, Silverlight and progressive download, the latter using the same HTTP protocol as Web pages (see progressive download). Large downloads such as gaming software are also candidates for CDNs. The CDN may pull the data from the customer's origin server, or the customer may upload the files to the CDN.

Server-Side Processing
The CDN may offer server-side processing (Java, ASP, etc.). If the CDN does not do the processing, that operation takes place in the customer's servers, and the CDN can deliver the accompanying graphics or other downloads.

Hybrid CDN (Peer-to-Peer)
A CDN may support peer-to-peer processing, which requires client software to be installed in the user's computer or pre-installed in a set-top box.

The Vendors
As of 2020, Akamai, Google, Swarmify, Microsoft, Rackspace, Amazon and Limelight are among the largest CDN providers. See content peering.

Akamai's Control Center
Moving massive amounts of content every day, Akamai has a handle on the current state of the Internet. In mid-2008, Akamai's rotating world display (bottom) showed it was transmitting more than a trillion bits of data per second. See Akamai.

Akamai's Control Center
Moving massive amounts of content every day, Akamai has a handle on the current state of the Internet. In mid-2008, Akamai's rotating world display (bottom) showed it was transmitting more than a trillion bits of data per second. See Akamai.
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References in periodicals archive ?
Request Sample of Global Content Delivery Network (CDN) Market Report 2019 @:
The Company has a working capital deficit of CDN 61,345,000 as at March 31, 2019 which has decreased from the December 31, 2018 CDN 71,503,000 deficit.
"The 2019 NextGen Leadership Summit will be an amazing opportunity for CDN to gather our most dedicated young adult leaders and to connect them directly with the information they need and the people that can help them succeed.
With subscription-based IPC Contentcast CDN services, digital companies in the country can use them without the need to invest in special hardware equipment, maintenance and other related operational expenses.
The purchase price is being financed using a CDN 442,500 (USD 340,400) term loan, a CDN 212,800 (USD 163,600) equipment lease, and the balance in cash from the company's reserves.
CDN Solutions Group will uncover and discover more latest trends and solutions in the largest ICT expo CommunicAsia 2017 at stand BE2-05 in Marina Bay Sands, Singapore during 23rd to 25th May 2017.
Apart from this, every year, CDN Solutions Group participates in many global ICT expos such as CeBIT Australia, CeBIT Germany, CeBIT India, Gitex, CommunicAsia, Communic Indonesia, HKTDC ICT Expo, MWC, Japan IT Week, Indiasoft, and many more.
A CDN consists of a series of appliance which serve high bandwidth traffic, usually organised into physical locations called Points of Presence (PoPs), which comprise the "edge".
Intigral, a provider of video delivery solutions in the Middle East and North Africa region has selected vBroadpeak, a provider of content delivery network (CDN) technologies and live and video-on-demand (VOD) servers to support the deployment of its CDN and video distribution platform.
[USPRwire, Tue Nov 10 2015] Content Delivery Network (CDN) Market by Solutions (Web Performance Optimization, Media Delivery, Cloud Storage and Data Security, Transparent Caching, Transcoding & Digital Rights Management and Analytics and Monitoring) - Global Forecast to 2020
CDN DISPLAYS SHOWCASE THERMOMETERS AND TIMERS: CDN has launched two new Starter Kits that come preloaded with its most popular thermometers and timers.