The book explores the emerging field of nanoelectronics technology and its applications, with a focus on advanced semiconductor materials, devices, and circuits essential for VLSI design in IoT applications. It covers both two-terminal and multi-terminal devices, emphasizing their simulation, modeling, fabrication, and characterization. This book includes key topics such as novel material systems, band engineering, and modern fabrication techniques. This book serves as a valuable resource for Ph.D., postgraduate, and undergraduate students engaged in nanoelectronics research. It is also suitable as a textbook for elective courses in Electronics and Communication Engineering and Electrical Engineering at universities worldwide.