In Shared hosting, the provider is generally responsible for managing servers, installing server software, security updates, technical support, and other aspects of the service.
Most servers are based on the Linux operating system and LAMP (software bundle), which is driven by the reliability and security of open source software such as Linux and Apache (the 'L' and 'A' of LAMP). Some providers offer Microsoft Windows-based or FreeBSD-based solutions.
For example, the Plesk control panel is available for two operating systems, Linux and Windows
There are thousands of shared hosting providers in the United States alone.
They range from mom-and-pop shops and small design firms to multimillion-dollar providers with hundreds of thousands of customers.