You’re likely familiar with the traditional way a clipboard can cut, copy, and paste on a Mac: you highlight text or an image, hit Edit > Copy or Cut in the application you’re using, and then Edit > Paste wherever you want the text or image to go. How to Copy and Paste Content With the Clipboard on macOS You just need to ensure both devices are on the same Wi-Fi, logged into the same iCloud account, and have Bluetooth turned on.
The Universal Clipboard allows you to copy text from one device, like your iPhone, and paste it onto your Mac. Macs, iPads, and iPhones also use a Universal Clipboard, as of macOS Sierra and iOS 10. It logs the content you want to move around, and either places a copy or allows the original content to be placed elsewhere. The clipboard in your computer is what lets you copy, cut, and paste text or images in different applications.