A wireless network refers to a computer network that utilizes wireless data connections among network nodes. They are unique as they can connect devices, services, people and applications to a network, without being bound to any wired hardware. Wireless networking enables businesses to create local area networks (LANs), wide area networks (WANs), and metropolitan area networks (MANs) without using cables. A wireless LAN reduces the cost of installing LAN cabling and makes changes to network structure and its relocation easier. Wireless local area networks (WLANs), terrestrial microwave networks, wireless sensor networks, cell phone networks, and satellite communication networks are a few examples of wireless networks. They are a widespread choice for telecommunications, and residential and commercial networks. Various applications of wireless networking include television remote controls, cell phones, computer interface devices, security systems, Wi-Fi, wireless power transmission, and a variety of wireless communication based projects. This book aims to shed light on the theory and applications of wireless networks. It will serve as a reference to a broad spectrum of readers.