This document provides an overview of mobile computing, including definitions, types of wireless devices, challenges, and applications. Mobile computing allows users to access network services from anywhere using portable computers that maintain network connections while on the move. It enables new applications by bringing computer access to areas without existing infrastructure and allowing mobility. Key challenges for mobile computing include low bandwidth, security risks, and adapting to different device capabilities. The future of mobile computing may include greater use of artificial intelligence and increased processor speeds and compact sizes.