Linux Distros are a combination of the core Linux kernel, the desktop environment, and the pre-installed software packages. Some distros are meant to be servers and have no desktop systems to save on system resources, but other distros are for specific industries and have extensive amount of software installed. Many of the common distributions are meant to be replacement operating systems so they come with basic system tools and a few common programs like LibreOffice. Browse the various distro overviews to see which distro you want to try.