Technically, Linux refers to the Linux kernel written by Linus Torvalds. But Linux usually refers to the Linux kernel plus the other operating system infrastructure sometimes called GNU/Linux. Together they make an open source, Unix like operating system.
Because Linux is open source. it has been adapted to run on everything from single chip computers to mainframes.
Linux can be found in smartphones, routers, NASs, set top boxes and many other devices.
There are a number of desk top environments that can be added to Linux for desktop computers and laptops. This is often favoured by developers who are developing for Linux servers.
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