Question

the first screen that appears when we switch on the computer which has Windows installed on it one word answer

Answer 1

window home screen is displayed when you start the computer

Answer 2

A computer without a program running is just an inert hunk of electronics. The first thing a computer has to do when it is turned on is start up a special program called an operating system. The operating system's job is to help other computer programs to work by handling the messy details of controlling the computer's hardware.

The process of bringing up the operating system is called booting