With Handoff, you can continue on one device where you left off on another. Work on a presentation on your iMac, then continue on your iPad. Or start an email message on your iPhone, then finish it on your iMac. View a message on your Apple Watch, and respond to it on your iMac. You don’t have to worry about transferring files. When your iMac and devices are near each other, an icon appears in the Dock whenever an activity can be handed off; to continue, just click the icon.
Note: To use Handoff, you need an iPhone or iPod touch with iOS 8 or later, or an iPad with iPadOS installed. Make sure your iMac, iOS device, or iPadOS device have Wi-Fi and Bluetooth turned on and are signed in with the same Pick up where you left off with Handoff in the macOS User Guide.