Cross-platform development in mobile apps allows for the creation of applications that run on multiple platforms, such as iOS and Android, using a single codebase. This approach significantly reduces development time and cost, as developers do not need to write separate code for each operating system. Additionally, it enables broader access to users, increasing the app’s potential audience. Tools and frameworks like React Native and Flutter facilitate this process, providing the necessary libraries and support for efficient development. Ultimately, cross-platform development promotes rapid deployment and can lead to greater innovation in mobile app design.