Xcode is a MacOS app made by Apple for app development . It is the only officially supported way to develop iOS and other Apple OS apps. You can think of Xcode as your pen and paper for app development. You use Xcode to write your code and build your user interfaces.
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No, Xcode not required unless you want to develop iOS, iPadOS, macOS, watchOS, tvOS apps. For building CLI apps you may need the Command Line Tools. It is a small self-contained package available for download separately from Xcode and that allows you to do command line development in macOS.8 Ara 2015
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