Mobile app development involves designing, building, testing, and deploying applications for mobile platforms such as Android and iOS. It includes native development (using platform-specific languages like Swift for iOS or Kotlin for Android) and cross-platform development (using frameworks like Flutter or React Native). These apps can range from simple utilities to complex business tools, offering users enhanced functionality, convenience, and interactivity on the go. The process often includes user interface (UI) design, backend integration, and performance optimization to ensure a seamless user experience.