The technology that enables developers to build applications for both iOS and Android devices is called cross-platform development frameworks. These frameworks, such as React Native, Flutter, and Xamarin, allow developers to write code once and deploy it across multiple platforms, streamlining the development process. This approach reduces time and costs associated with developing separate applications for each operating system. Cross-platform frameworks often provide tools and libraries to deliver native-like performance and user experience, enhancing app functionality and reach in the competitive device landscape.