WordPress is a free and open-source content management system written in PHP and paired with a MySQL or MariaDB database. Features include a plugin architecture...
A website on shared hosting sits on the same server as many other sites, from a few to hundreds. In this setup, all the websites share the storage, RAM and CPU of that server.
With cloud hosting, resources are virtualised, so CPU, memory and storage can be increased more easily when your website needs more. The included resources are shown on the cloud hosting page.