<P> A content delivery network or content distribution network (CDN) is a geographically distributed network of proxy servers and their data centers . The goal is to distribute service spatially relative to end - users to provide high availability and high performance . CDNs serve a large portion of the Internet content today, including web objects (text, graphics and scripts), downloadable objects (media files, software, documents), applications (e-commerce, portals), live streaming media, on - demand streaming media, and social media sites . </P> <P> CDNs are a layer in the internet ecosystem . Content owners such as media companies and e-commerce vendors pay CDN operators to deliver their content to their end users . In turn, a CDN pays ISPs, carriers, and network operators for hosting its servers in their data centers . </P>

Which of the services are used to distribute content to end users