What it is: Apple announced at their Worldwide Developers Conference a new feature of macOS 10.15 Catalina called Sidecar, which lets you use the iPad as a second screen or stylus.
Any time you develop a useful feature, Apple may take it over. At one time, iPhone flashlight apps were popular until Apple incorporated that feature in iOS. Today, many apps let you connect your iPad to your Macintosh and use the iPad as a second display.
Now the latest macOS 10.15 Catalina offers a feature called Sidecar, which lets you do exactly that. Prop your iPad next to your Macintosh and use it as a second display. You can connect the iPad wirelessly or with wires.
More amazing is that you can also use the Apple Pencil with the iPad to turn the iPad into a stylus so you can draw on it and have your drawing appear directly on the Macintosh screen. In the past, you needed a specialized digital stylus tablet from Wacom or other companies. Now you can get that same feature just by using an iPad and an Apple Pencil.
For many people, this won’t be a crucial feature but others will likely adopt it just for the extra monitor screen alone. Rather than buy a second monitor, it’s cheaper and easier just to use an iPad.
Even better is that with the Apple Pencil, you can draw directly on the iPad, which is far easier than trying to draw using the mouse or touchpad.
The future of the Macintosh looks bright. Expect the latest version of macOS to leave behind older Macintosh models so you’ll want to get the latest version of a Macintosh you can afford along with the latest version of an iPad you can afford. If you need both a Macintosh and an iPad, and you need a second display or a digital stylus for drawing by hand, then you’ll be able to justify getting an iPad to go along with your Macintosh capable of running macOS 10.15 Catalina.