This book mainly focuses on Undergraduate students to understand the basic concept of Wireless Sensor Networks (WSN). "Introduction to Wireless Sensor Network " Book Explain various concepts and terminologies used in WSN. Describe importance and use of radio communication and link management in WSN. Explain various wireless standards and protocols associated with WSN . Recognize importance of localization and routing techniques used in WSN . Understand techniques of data aggregation and importance of security in WSN . Examine the issues involved in design and deployment of WSN.