A content delivery network (CDN) is a system of distributed servers (network) that deliver webpages and other Web content to a user based on the geographic locations of the user, the origin of the webpage and a content delivery server.
Using the CDN is essential if you want to reach users around the world, either for downloading files, or deploying websites and web applications. Below are the advantages of using CDN:
Content delivery networks use strategically placed servers that
increase network backbone capacity.
CDNs place servers as close as possible to groups of users. This is
done to minimize packet loss and latency because the data travels
short distances to reach users.
Providers of CDN technology can deliver load statistics in real time,
give displays on active regions, know popular regions and optimize
capacity for individual customers.
Without CDN, it is easier for server failure/malfunction to cripple a website.
With CDN, this threat is decreased because the user will be directed to
another server immediately and increasing uptime for website owners.
CDN ensures consistency and integrity of data. This is possible because
updated information is instantly mirrored to different servers.