Website caching can make your website load faster.
This will make your website visitors happier, as well as the search engines.
The process of caching means storing copies of website files in a cache, in order for them to be accessed quickly. A cache allows for temporary file storage.
The next time that a visitor returns to a website, their website browser will load the cached files.
On the other hand, a CDN (Content Distribution Network) has proxy servers that are located in multiple locations. They enable quicker content delivery. CDNs store copies of website files.
When a website visitor loads a web page, this is sent to the nearest CDN server. Media files can then be loaded more rapidly.
CDNs can help to improve visitor experience when they view your website on a smartphone, particularly if you make extensive use of media files.
Caching can be delivered at the server level. Or it can be handled using a WordPress plugin. This type of plugin usually offers a number of features, including CDN.