EMZETT.Ubuntu
In short: Ubuntu is a Debian-based Linux distribution by the company Canonical, first released in 2004 by Mark Shuttleworth.
In more detail: It is particularly beginner-friendly and widespread on desktops, servers and in the cloud.
In Depth
Details
A new version appears every six months, every two years an LTS version (long-term support) with five years of updates, for example 22.04 and 24.04. The default desktop is GNOME. Flavours: Kubuntu, Xubuntu, Lubuntu, Ubuntu Server.