Development builds of your app are Debug builds of your project. It includes the expo-dev-client library, which allows you to develop and debug projects using Expo CLI.
When your project requires custom native code, a config plugin, a custom runtime version, or a reduced bundle size of the app, you can transition from using Expo Go to developing a development build.
A development build of your app is a Debug build that contains the
expo-dev-client package. As a production build is for the general public, and a preview build lets your team test your next release, a development build lets developers iterate as quickly as possible. It comes with extensible development tools to develop and test your project.
You can think of a development build as your fully customizable version of Expo Go.
expo-dev-client package replaces the default in-app development tools UI that React Native provides (the Dev Menu) with a more powerful and extensible UI and adds a launcher UI, so you can launch updates (such as from PR previews) and switch between development servers without needing to rebuild the app binary.
If you are looking to learn how to compile and build your app locally when using Expo.