Linux is a free and incredibly powerful operating system kernel with open source code. One of its main advantages is its open-source nature, meaning anyone can view, modify, or enhance the software. Operating systems based on the Linux kernel are highly flexible and adaptable for various purposes, from personal use to corporate servers. This operating system kernel, or computer brain, manages everything happening on the computer, including interaction with hardware and programs.

Linux is widely used across many areas that surround us. For instance, it's an integral part of modern programming, as many applications and websites are developed and deployed on servers running Linux. Additionally, Android, the world's most popular mobile operating system, is also based on the Linux kernel.

Most networking devices like routers and network switches also run on Linux. This is because it is reliable, stable, and easily adaptable to the needs of network systems. Moreover, Linux is a popular choice for servers, providing data storage, web hosting, data processing, and much more.

So, Linux isn't exactly an operating system. Linux is a flexible and powerful tool used in many aspects of our digital lives, providing reliability, security, and efficiency.