This document discusses different types of operating systems including GUI, multi-user, multiprocessing, and multitasking operating systems. It describes that a GUI operating system uses graphics and icons navigated by a mouse, a multi-user OS allows multiple users to use the same computer simultaneously or at different times, a multiprocessing OS supports more than one processor, and a multitasking OS allows running multiple processes concurrently. The document also provides general information about operating systems, their parts including kernels and GUIs, common software like Windows, Mac OS, and Linux, and functions like controlling hardware, running applications, and accessing the internet.