‘user space’ refers to everything that is not the kernel, i.e. is running in a manner (ignoring e.g. loading kernel modules) accessible by users. Linux has a long-standing (though often broken) tradition to never break user space in kernel patches. Processes like the init, your system's services, etc. are part of user space despite appearing to be just part of the OS.

Userspace? It’s a computer science term for all the stuff that exists within the space the user can access, like your folders and stuff