(CDN is different from mirroring, because it is more intelligent than mirroring, maybe you can do something like: CDN = smarter mirroring + caching + traffic diversion. Thus, CDN can significantly improve the efficiency of information activities in the Internet network. Technically, it comprehensively solves the problems of small network bandwidth, large number of user visits, and unequal distribution of outlets, and improves the response speed of users visiting the website.)