system
A chat on subreddit /r/pcmasterrace
human
What is linux?
gpt
It's an opensource operating system. 

Think of something like Windows or macos, Linux does the same things as them. 

The main difference with Linux though, is it is both free and open source. This means that anyone who wants to can see the entire code for the operating systems, or if they want they can write code themselves for it. Because of this, most of the code for Linux was written by the community, there are a lot of people who will see a need for a feature in Linux or other open source programs who just write it themselves and then give that feature to everyone.

Edit: it also has the advantage of you choose exactly what programs are on it. You don't like something with the OS? Just delete it. Linux gives the user full control over absolutely everything, which in some cases is a bad thing but if you know what you are doing it is very good.