Let's say you want a second screen for your Mac to extend or mirror your current display. If you're running macOS Catalina or higher and own an iPad, you can do it through a feature called Sidecar.

Maybe you have a MacBook with a small screen or a Mac mini connected to a TV or external monitor, and you feel like you could use a second screen or device to extend or mirror your current display.

Apple likes to promote the idea that an iPad can replace a laptop or desktop computer — we all remember the infamous “What’s a computer?” TV ad. One of the ways this is supported is connecting to an ...