App development is the process of creating software applications for mobile devices, such as smartphones and tablets. An app, short for application, is a piece of software that performs a specific function or set of functions. There are many different types of apps, including games, productivity tools, and social media platforms.

App development involves a number of steps, including planning, design, coding, testing, and deployment. It requires a combination of technical skills, such as knowledge of programming languages and frameworks, and creative skills, such as the ability to design user interfaces and user experiences. App developers may work independently or as part of a team, and they may work for companies that specialize in app development or for businesses that need custom apps for their operations.