Mobile app development refers to the process of creating software applications that run on mobile devices such as smartphones and tablets. This involves designing and developing an application's user interface, defining its features and functionality, and coding it for a particular mobile operating system like iOS or Android. Mobile app development can range from building simple applications that perform basic tasks to complex apps that integrate with other software systems and leverage advanced technologies like machine learning and artificial intelligence. The process also involves testing, debugging, and deploying the application to the relevant app stores for distribution to users. Mobile app development is a rapidly growing field, driven by the increasing ubiquity of mobile devices and the growing demand for mobile software solutions.