In ‘Wireless Sensor Networks Applications’ by APU’s School of Engineering, speaker and Associate Professor Dr. K V L Narayana discusses the basic concepts of wireless sensor networks and its applications. The contents of the presentation include explaining different types of wireless networks; an introduction to wireless sensor networks (WSNs) including an overview, communication aspects, and protocols; applications of WSNs; and research issues in the development of WSNs. The lecturer first discusses different types of wireless networks, including W-WAN, W-MAN, W-LAN, and W-PAN. Narayana then explains the modes of wireless LAN. The IEEE 802.11 standard defines two modes: instructor mode and ad hoc mode. Narayana then defines and explains ad hoc networks, wireless network performance, sensor networks, and the working process of sensor networks. Next, is an overview of WSNs, the typical sensor network arrangement, roles of participants in WSN, and WSN topologies. Narayana also discusses various architectures, including clustered architecture. Explained next are the components of wireless sensor nodes, radio transceiver usage, clustered communication, sensor node constraints, and some examples of sensor nodes. Narayana concludes the lecture by discussing Smart Cities, deployment and application options for WSNs, maintenance options of sensor nodes in WSNs, and WSN requirements.