Building a mobile application traditionally means working with platform-specific technologies and development environments for Android and iOS. React Native takes a different approach by allowing developers to create native mobile interfaces using React and JavaScript or TypeScript, while Expo provides a set of tools and services that make the React Native development process easier.

React Native uses components that map to native platform elements, allowing applications to provide a native user experience while sharing much of the code between Android and iOS. Developers can use familiar React concepts such as components, props, state, and hooks while adapting them to mobile interfaces and device capabilities.

Expo builds on top of React Native by providing a streamlined development environment and a collection of APIs for common mobile features. Camera access, notifications, location, image handling, device information, and other capabilities can be integrated without developers having to configure every native dependency manually.

The development workflow is another area where Expo is useful. Developers can create a project quickly, run it on a physical device or emulator, and see changes during development. Expo also provides tools for building and deploying applications, helping developers move from local development toward production releases with less platform-specific configuration.

React Native and Expo are particularly useful for developers who already work with React and TypeScript. A shared codebase can reduce development time while still allowing platform-specific behavior when necessary. This makes the combination suitable for applications such as social platforms, dashboards, marketplaces, productivity tools, and other mobile products.

React Native provides the foundation for building cross-platform native applications, while Expo simplifies many of the tools and services surrounding the development process. Together, they offer a practical workflow for developers who want to create Android and iOS applications without maintaining completely separate codebases for each platform.