App development is the process of creating software applications that can be installed on mobile devices, tablets, and desktop computers. These applications can serve a wide range of purposes, from entertainment and gaming to productivity and business.

App development involves several stages, including ideation, design, development, testing, and deployment. Developers use programming languages like Java, Swift, Kotlin, and React Native to create mobile apps for Android and iOS platforms. They may also use web technologies like HTML, CSS, and JavaScript to create hybrid apps that work across multiple platforms.