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This book introduces wireless powered communication networks (WPCNs) as a promising paradigm to overcome the energy bottleneck suffered by traditional wireless communication networks as well as emerging Internet-of-Things (IoT) networks. It selectively spans a coherent spectrum of fundamental aspects in WPCNs, such as wireless energy transfer (WEH) techniques, radio frequency (RF) energy harvesting receiver model, simultaneous wireless information and power transfer (SWIPT) as well as the rate-energy tradeoff arising from the joint transmission of information and energy using the same waveform. It also reviews existing literature on the network models for WPCNs, including the baseline and dual-hop WPCN models and a variety of related extensions. This book further examines the key factors including throughput, fairness, and security that must be taken into account for impeccable operation of WPCNs. The new IoT applications are targeted as a key element in those factors. The steady growth in wireless communications, fostered by the prosperity of mobile services, has resulted in an unprecedented awareness of the potential of physical layer security (PLS) to significantly strengthen the security level of current systems. The fundamental idea of PLS is to exploit the inherent randomness of fading and interference of wireless channels to restrain the amount of information that can be gleaned at the bit level by a passive eavesdropper. Although having been studied extensively in various kinds of networks such as wireless sensor networks, cellular networks, cognitive networks, it is fair to acknowledge that the practicality of PLS in WPCNs is still an open problem. This is the first book examining the current research to provide a unified view of wireless power transfer (WPT) and information transmission in WPCNs from a PLS perspective. Focused on designing efficient secure transmission schemes, analyzing energy evolvement process, and evaluating secrecy outage performance under different channel state information (CSI), the results presented in this book shed light on how to best balance security and throughput with prudent use of harvested energy in WPCNs.