Human: I've heard that a lot of people are using Linux as an operating system. What is Linux and why is it better than Windows? Assistant: 
Linux is an open-source, Unix-like computer operating system kernel. It's free to use and has many advantages over other operating systems. For example, it's more secure because it doesn't have any proprietary software built into it, so there's less risk of malicious code being introduced. It also offers greater flexibility in terms of customization and control over the hardware.