Linux is a computer operating system kernel. A computer operating system is the set of basic programs and utilities that make your computer run and Linux is used as the core (kernel) of the operating system.
When people talk about Linux they are typically referring to a distribution of Linux. A distribution is a collection of software including a kernel and user applications that are put together in once cohesive package. Common distributions include: Ubuntu, ArchLinux, Fedora, CentOs.
Unlike other software, Linux is not made or owned by any one company. Linux was initially designed by Linus Torvalds in 1991 and the applications that run on Linux have been developed by a collaborative community of thousands of independent programmers throughout the world. Many of the applications have been written or re-written by the GNU Foundation.
Linux and associated applications are released under open source licenses so that others may freely modify and improve the software without having to pay royalties.
Linux has been designed from the ground up to be a freely available, secure, stable, internet ready, multi-user operating system. It is well tested and has a lot of corporate backing!
It can also be improved by anyone with the proper technical knowledge which means it is extremely flexible and generally on the forefront of technical development.
Linux can be used in a variety of settings including personal computers, server computers and even in cellular telephones, personal digital assistants and other appliances. We're here to answer your questions!