What is Linux?
Linux is a multi-user open source operating system. Most varieties of Linux are available free of charge, though some distributions are commercial ventures.
Linux servers, in addition to bringing additional security to your web site, also bring additional speed. Linux servers can host multiple, complex, high-traffic web sites and still perform much faster than comparable systems running Windows. Hosting your web site on a Linux server brings speed, security, and stability to your web site.
Linux is part of the LAMP architecture for web servers.