ĬDNs are a layer in the internet ecosystem.
Since then, CDNs have grown to 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. CDNs came into existence in the late 1990s as a means for alleviating the performance bottlenecks of the Internet as the Internet was starting to become a mission-critical medium for people and enterprises. The goal is to provide high availability and performance by distributing the service spatially relative to end users. A content delivery network, or content distribution network ( CDN), is a geographically distributed network of proxy servers and their data centers.
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