XCode is the most popular integrated development environment (IDE) for developing Mac OS and iOS apps. It is a powerful tool that provides the necessary tools for developers to create high–quality apps. XCode offers a variety of features such as a code editor, debugger, and compiler, as well as access to the Apple Developer Network. Additionally, XCode is easy to use and provides an intuitive user interface that makes developing apps easier. XCode also offers integration with other third–party tools and services, which makes it a great choice for developers who want to create powerful, feature–rich apps.