The Apple Watch lets you optimize the way you use your Mac. When the watch is on your wrist, you can simply bring your Mac out of sleep mode without having to enter your password.

To enable this feature, you must:
1. Enable Wi‑Fi and Bluetooth functions on Mac;
2. Log in to iCloud using the same Apple ID on Mac and Apple Watch, and enable two-factor authentication for Apple ID;
3. Set the passcode on the Apple Watch;
4. On Mac, open the Apple menu - "System Settings";
5. Go to the "Protection and Security" section and click "Basic";
6. Select "Use Apple Watch to unlock apps and your Mac" or "Allow Apple Watch to unlock Mac". If you have multiple Apple Watches, select the watch you want to use to unlock apps and your Mac.