This book provides an in-depth study of mobile, wireless, and sensor networks, highlighting the technologies that support modern connectivity and intelligent systems. It examines wireless communication principles, mobile network protocols, and the integration of sensor technologies for real-time data collection and processing. The text also explores applications such as IoT, smart cities, industrial automation, and environmental monitoring. Readers gain insights into network design, performance optimization, security challenges, and emerging trends in next-generation wireless systems. By combining theoretical knowledge with practical implementation, the book equips students, engineers, and researchers with the skills to understand, design, and manage advanced network systems. Emphasis is placed on scalability, reliability, and efficiency in a rapidly evolving technological landscape. This resource serves as a comprehensive guide for navigating the complexities of interconnected wireless and sensor-based networks.