On a typical day, we check emails, update social network profiles, make mobile phone calls, use public transportation, take planes, and transfer money and goods. In all these cases — consciously or not — we are using networks and their properties. ‘A network point of view on the world’ looks at emergent phenomena, complex systems, universality, and self-organised processes to explain how networks work. Originally developed in mathematics by Leonard Euler, network theory is now used in sociology, physics, engineering, computer science, and biology. In the study of complex, emergent, and self-organised systems, networks are becoming increasingly important as a universal mathematical framework, especially when massive amounts of data are involved.