The iPadOS and Catalina OS allow Mac and iPad people to use the new Sidecar feature. Sidecar allows you to connect your iPad to a Mac as a second screen. Not all Macs and iPads can use Sidecar. This article lists which Macs and iPads can use this nifty feature. Since I have an iPad Pro 10.5 and a new iMac I can use it, how about you?