LiteSpeed Enterprise is a commercial webserver which provides tremendous performance boost over other webservers, including Apache Webserver which is what most hosting providers are using (because it is free).
LiteSpeed Enterprise is up to 9 times faster than Apache Web Server and processes PHP 50% faster. It also fully supports .htaccess, mod_rewrite, and everything else that Apache Web Server is well known for.
Additionally, LiteSpeed Enterprise developed LiteSpeed Cache which is a WordPress caching plugin that you can only use on hosting servers using LiteSpeed Enterprise. LiteSpeed Cache has quickly gained popularity for its performance benefits over traditional caching plugins. This is because unlike traditional caching plugins which operates from the file-level, LiteSpeed Cache operates from the server-level by communicating directly with LiteSpeed Enterprise which is a far more efficient and superior process.