Mobile app development refers to the process of creating software applications that are designed to run on mobile devices such as smartphones and tablets. These apps can provide a wide range of functionality, from simple games and productivity tools to complex business applications and e-commerce platforms. The process of mobile app development typically involves several steps, including idea and concept development, design and planning, coding and testing, and deployment and maintenance. It may also involve working with various technologies and platforms, such as Android and iOS, as well as cloud-based services and APIs.