If you own an Apple Watch, you can unlock your Mac without having to type in a password.
Just sit down at your computer and, boom, it’ll unlock itself.
It’s a feature Apple has been offering for a bit under a year, but it’s one that I hadn’t ever used myself. I recently picked up one of Apple’s new MacBooks, however, and instantly fell in love with the option. It’s super easy to set up yourself.
That’s all there is to it!
Now, when your Mac is locked and you’re nearby running watchOS 3 or newer (you almost certainly are if you’ve updated your Apple Watch in the last year), the watch will unlock your Mac for you.
Source: Tech CNBC
How to unlock your Mac with your Apple Watch