The update also improves the stability, reliability, and security of your Mac. This update also includes bug fixes and other improvements: Fixes an issue that may prevent Reminders from sending notifications for recurring reminders.

What is macOS Catalina used for?

In macOS Catalina, developers are able to port their iPad apps over to the Mac, and in later updates, the functionality extends to the iPhone. The ability to port iOS apps over to Mac has brought more apps designed for the Mac to the Mac App Store.

Is macOS Catalina good?

Catalina runs smoothly and reliably and adds several appealing new features. Highlights include the Sidecar feature that lets you use any recent iPad as a second screen. Catalina also adds iOS-style features like Screen Time with enhanced parental controls.