Shared servers are the entry-level hosting option. They’re the cheapest and require minimal, if any, technical know-how. Multiple websites are hosted on a single server, and therefore share its resources such as data transfer and disk space. This can be the perfect option for a small- to a medium-sized site with fewer than 30,000 visitors per month.
Hosting that is aimed at specific CMS platforms and tweaked optimally for them: e.g., WordPress hosting, Drupal hosting, Magento hosting, etc. In these cases, the best hosts do far more than just provide the minimal requirements for those platforms. They provide a rich, and fully managed environment so your site can perform like a well-tuned machine.