macOS Catalina and iPadOS include support for a new feature called Sidecar, designed to let you use your iPad as a secondary display for your Mac. Sidecar is quick, simple to use, and can either mirror content on your Mac or turn it into a secondary display for extra screen real estate no matter where you are.
This guide covers everything you need to know about Sidecar, from how to use it to compatibility to Apple Pencil integration.
Read more at MacRumors.com