Compare Lock, Log off, Sleep, Restart, and Shut down in terms of what happens to the user's session and the computer.

### Why this is right The key distinction is whether the user’s **session**, meaning their signed-in account and open work, remains available, ends, or is closed as the computer powers down or starts again. Lock and Sleep preserve the session, while Log off ends it; Restart and Shut down close it, but only Restart immediately starts the computer again. ### The concept Lock puts a sign-in screen in front of your open session, preventing access until you unlock it; your programs remain open. Log off ends your account session and closes its programs, so save work first. Sleep is a low-power state that uses little energy while preserving the session so you can resume it. Restart closes the current session and then starts the computer again. Shut down closes the session and turns the computer off, so you must turn it on again to use it. | Action | What happens to the session? | What happens to the computer? | |---|---|---| | Lock | Remains open | Continues running | | Log off | Ends | Continues running at the sign-in screen | | Sleep | Remains open | Enters a low-power state | | Restart | Closes | Starts again | | Shut down | Closes | Powers off | ### What a good answer covers - Lock blocks access without closing the signed-in session or its open programs. - Log off ends the user’s session but does not itself power off the computer. - Sleep conserves power while preserving the session for resuming. - Restart closes the session and starts the computer again. - Shut down closes the session and powers off the computer. ### Watch out Lock and Log off can both show a sign-in screen, but only Log off ends the session. Sleep is different from Shut down: Sleep preserves the session, while Shut down closes it. ### Terms - **Session**: The period in which a user is signed in, including the programs and work open under that account. - **Lock**: An action that blocks access and requires sign-in to return to an existing session. - **Log off**: An action that ends the current user’s session and closes its programs. - **Sleep**: A low-power computer state that preserves the current session so it can be resumed. - **Restart**: An action that closes the current session and starts the computer again. - **Shut down**: An action that closes the current session and powers off the computer. - **Low-power state**: A mode that uses less energy than normal operation while keeping the computer ready to resume. ### Remember Lock protects an open session; Log off ends it; Sleep preserves it with low power; Restart closes it and starts again; Shut down closes it and powers off.