Computer basics, in plain English · Updated October 1, 2026
Your computer offers several power choices. Here is what the main ones mean.
The simple answer
Sleep pauses for a break. Shut down turns the computer off. Restart closes and starts the computer’s system again. Save your work before choosing a power option.
Sleep: taking a short break
Sleep uses less power and usually keeps your session ready to return to. Waking it often brings you back to the apps you were using.
The details vary by device and settings. Sleep is not a substitute for saving: a flat battery or power problem can still interrupt your work.
Shut down: finishing for now
Shut down closes the session and turns the computer off. Use the on-screen command so the system can finish properly.
On Windows, choose Start → Power → Shut down. On a Mac, choose Apple menu → Shut Down. Save first and let it finish.
Restart: a fresh start for the system
Restart closes the system and starts it again. It can help after a software problem or when an update asks for it.
On Windows, choose Start → Power → Restart. On a Mac, choose Apple menu → Restart.
If instructions say Restart, use that choice. Turning off the monitor or closing a laptop lid is not the same action.
Which should I choose?
- A short break: Sleep is usually convenient.
- Finished using it: Shut down is an option when you no longer need it running.
- An app or device is acting strangely: Save, then try Restart.
- An update requests a restart: Follow its instructions and allow time to finish.
What about the monitor’s power button?
On a setup with a separate monitor, that button usually controls the screen only. The computer may still be running.
A laptop or all-in-one combines parts in one housing. Learn more in What Is a Computer?
Before you step away
Save your work and lock your screen if others could access it. Locking protects your session; it does not necessarily put the computer to sleep.
If a long upload or other task needs to continue, check its requirements and your device’s sleep settings. Do not assume closing the lid will keep it running.
Avoid pulling the power plug or holding the power button as your normal way to turn off a computer. Forced power-off can lose unsaved work.
Windows references: Microsoft’s power-options guide and restart instructions. Mac reference: Apple’s shut down and restart guide.
Why does restarting help? Read our simple explanation: Why turning it off and on again actually works.
Keep learning: What Is a Computer? · More beginner guides
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