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• It allows a device to easily interact in short distance or long distance communication.
                    • Some of the commonly used mobile OS are Android, iOS, etc.














                                                  Android                          iOS

                         Booting

                 Booting is a process of starting the operating system and loading it in the computer’s memory when the power
                 is switched on. It is of two types:
                    • Cold Booting: After the computer is shut down completely followed by power off and then we switch it on to
                   start it, then, it is called cold booting.
                    • Warm Booting: It is when we press the Restart button without switching off the power supply and the computer
                   is reloaded with all its operating system files.

                         Procedure for Starting a Computer


                 When the power button is switched on, Windows 11 follows the given Start up Process:
                    • As soon as the power is on, ROM loads the BIOS instructions into the computer’s memory.
                    • It does Power On Self Test to check that all the hardware devices are functioning properly with constant supply
                   of the electricity. In case there is any error, a beep sound is produced, an error message is displayed on the
                   screen and the system stops loading windows.

                 Login and logout

                 The term "login" refers to the process of accessing and entering a user account to access the user's personalised
                 desktop environment. It involves  the steps necessary for providing the credentials details like username and
                 password etc. so that an authenticated person will gain access to the operating system. A login ID and password
                 is like a key to the lock which allows you to use the computer.
                 The login process is the initial step after starting or restarting a computer. The steps involved in login:

                 Step 1    Windows will display a sign-in screen where you can see a list of user accounts or enter your username/
                           email and password.
                 Step 2   Windows will verify your credentials against the information stored for the selected user account.
                 Step 3    Upon successful authentication, Windows will load your personalised desktop and launch background
                           processes.
                 Step 4   You are now logged in, and your user session begins.

                 Logging out is an essential step for security and privacy, as it ensures that unauthorised users cannot access your
                 account or data after you have finished your session. When you log out, you terminate your current user session,
                 and access to the system or application is restricted until you log in again.

                 The steps involved in logging out of Windows 11 will be:
                 Step 1    Click on the Start menu or press the Windows key on your keyboard.

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