This textbook reviews the theory, applications, and latest breakthroughsin Delay Tolerant Networks (DTNs). Presenting a specific focus on Opportunistic Mobile Networks (OMNs), the text considers the influence of human aspects, andexamines emerging forms of inter-node cooperation. Features: containsreview terms and exercises in each chapter, with the solutions and source codeavailable at an associated website; introduces the fundamentals of DTNs, covering OMNs, PSNs, and MOONs; describes the ONE simulator, explaining how to set up a simulationproject; provides detailed insights into the development and testing ofprotocols, together with a set of best practices for increased productivity andoptimized performance; examines human aspects in the context of communicationnetworks, from human-centric applications to the impact of emotion onhuman-network interplay; proposes various schemes for inter-node cooperation in DTNs/OMNs; presents a detailed discussion on aspects of heterogeneity in DTNs.