The term user interface procedures that it easy to use. In 1970s and 1980s computers systems were complex.
In 1984, Apple produced the Macintosh. That was first computer with a graphical user interface. A few years later, Microsoft launched Windows.
A GUI makes use of a WIMP environment: windows, icons, menus and pointer. Double Clicking a folder opens a window which contains programs and documents. A modern OS allows multitasking, that means you can run several tasks simultaneously.
The most popular operating systems are Windows, Mac Os, Unix, Linux.
The most common user interface today is a graphical user interface or GUI. VR uses graphics to generate on imaginary world.
You put on a head-mounted display to see that makes you feel as you are there. There are such devices as data glove, virtual mouse, body suits and so on. These systems are used in Video games, architectural designs. Pilots use flight simulators for example.
VR systems are very useful.
(from “Mastories”, short stories by Mary Zhukova)