Mobile application development is the process of creating software applications that run on a mobile device. It involves building applications for platforms like iOS and Android, using programming languages and tools specific to each platform. Mobile app development can range from simple applications to complex solutions integrating backend services, user authentication, and real-time data synchronization. Successful mobile app development requires a strong understanding of user experience design, performance optimization, and platform guidelines. Continuous innovation and testing are crucial to deliver apps that meet user expectations and business objectives.