Most hosting services and personal websites use Unix/Linux systems, with usual configurations for WordPress sites.
For WordPress Version 4.0 and later:
PHP version 5.2.4 or greater (recommended: PHP 5.4 or greater)
MySQL version 5.0 or greater (recommended: MySQL 5.5 or greater)
(Optional) (mandatory for MultiSite) Apache mod_rewrite module (for cleaning URI’s called Permalinks).
It is recommended to use Linux as server, with a choice of Apache or LiteSpeed as the most robust platforms for running WordPress, but all servers have to support PHP and MySQL. If your host does not meet the conditions above, including mod_rewrite module, you should probably want to change to another host package, for there are many to fulfill the conditions.
It is also essential that your host allows remote connections.
Web hosting services
The web site hosting offers are becoming more common and when looking around, and it’s easy to find a web host that will meet the above terms. If you are looking for suggestions, please contact me.