Linux is an open source operating system you are quite familiar with it! Android on your cellphone tablet is Ubuntu run Linux.
Download Linux mint live on a DVD. Or USB you might find it better than windows a lot of people prefer it
Linux is a *nix like operating system that runs on common PC hardware and other hardware it is compiled for. Google's Android and Chrome OS are based on Linux. Steam OS (for gaming) is Linux and Steam and many Steam games can run in other versions of Linux. Raspberry Pi is an inexpensive computer on a credit card size board that runs Linux. Many routers and network gateways and other hardware run Linux or FreeBSD.
Although, many Linux distributions have an easy to use windowed desktop, if you dig into the underlying text terminal and learn commands in that, you will be able to find your way around other Unix or *nix like systems. For example I have been using Linux since before Win95 or Internet Explorer existed because my first ISP ran SunOS (Unix) and gave us a shell account and apache web space. So learning Linux helped me find my way around SunOS, and also FreeBSD and NetBSD on other systems.
I am posting this using Firefox in Linux.
Linux is a Unix-like, open source and community-developed operating system for computers, servers, mainframes, mobile devices and embedded devices. It is supported on almost every major computer platform including x86, ARM and SPARC, making it one of the most widely supported operating systems.
Linux is an operating system kernel that has userland utilities and tools built around it to form complete operating systems.
I tried Ubuntu (Linux) back in 2008…..it was so easy and trouble free that I still use it.
an operating system as Windows is an operating system.
an open-source operating system modelled on UNIX.