Linux is not an OS, but a kernel, meaning an intermediate software between your applications and hardware. The better the kernel, the better the system responds, and the better the error management. A complete operating system is called a Linux distribution (Linux distro). Among the Linux distributions, which are quite numerous, we mention Fedora, Ubuntu, Gentoo and OpenSuse. Today, Linux distributions target all computer users, whether they use them at work, school or at home.