I find this happens a lot on software like this and people kind of assume visitors know what all the buzzwords mean or are in the same bubble as the developers, which is a shame really as I assume it scares a lot of people off.
TLDR: it lets you automate installing an operating system and software, mainly used for servers.
The use case is more for server and linux-type operating systems but I bet there are some crazy folk who use it for their desktops. No idea!