Kubuntu vs Raspbian: What are the differences?
Kubuntu: An open-source operating system. It is a free, complete, and open-source alternative to Microsoft Windows and Mac OS X which contains everything you need to work, play, or share. It unites Ubuntu with KDE and the fabulous Plasma desktop, bringing you a full set of applications. The installation includes productivity, office, email, graphics, photography, and music applications ready to use at startup; Raspbian: A free operating system based on Debian. It is optimized for the Raspberry Pi hardware. It provides more than a pure OS: it comes with over 35,000 packages, pre-compiled software bundled in a nice format for easy installation on your Raspberry Pi.
Kubuntu and Raspbian belong to "Operating Systems" category of the tech stack.