CDN Infrastructure design?

Hi, I recently got an assignment to build a network with CDN capabilities for a growing company.

I’ve worked with DCs and Service providers (MPLS) before but this is the first time I’m dealing with a CDN infra from scratch.

I did a couple of searches on the topic but never got any example of a CDN infra or how you build one. But the way I understand it is, you simply make copies of your data and put it on different locations then register to a DNS provider to direct the clients to the closes edge device. So basically, you simply build multiple small scale DCs on different locations, connect them together and continually replicate/store your data between these PoPs?

If anyone can provide some insights or clarifications ( in the perspective of a network engineer) will be greatly appreciated. If you got a good resource/links, please do share them.

Thanks in advance!