It means hosting that is provided on Linux/Unix operating systems platforms. There isn't much difference between these two types of operating systems because Linux/Unix is an improved version of Linux/Unix operating system. When just applying for web hosting companies for web hosting that is based on Linux operating system it doesn't matter which one you are using on your computer as it is commensurable with any operating system.
USABILITY
Some years ago Linux operating system used to be available only for professionals and if you were not an experienced user you had no future with this OS. In the last couple of years the situation has changed. Providers have done their best to make users' web sites administrating more comfortable and easier. In case you're just a beginner you'll find friendly control panels that include Web- interface. And if you are an experienced user you can control your site by means of shell.
RELIABILITY
Experts claim that Unix-based platform is one of the most reliable ones but it will mainly depend on maintenance stuff professionalism. Thus quality and stability of Linux-based web hosting won't depend on some sudden system bugs and the operating system consistency itself secures your web site operating dependability.
