Hi
I would like to know if you have to rent a server when you have LMS Moodle
Thanks.
It requires a server to run. It can be run on your local machine but for anyone else to see it you will need a machine that your users can access.
Yes, Moodle is a client-server web application. Pl. read https://docs.moodle.org/en/About_Moodle.
But, if you pay for MoodleCloud, you don't need your own server. That is just one of various ways that you can pay someone else to look after the server for you.