Distro (short for distribution) refers to a specific version or variant of a Linux operating system. A Linux distro packages the Linux kernel with a collection of software, utilities, and a desktop environment (if applicable) to create a complete operating system tailored for different users or use cases. Examples of popular distros include Ubuntu, Fedora, Arch Linux, and Debian. Each distro has its own package management system, update cycle, and default configurations, catering to various preferences, from beginners to advanced users and specific applications like servers, desktops, or embedded systems.