Data science tools and the network science approach offer a unique perspective to tackle complex problems, impenetrable to linear-proportional thinking. Building on decades of development of fundamental understanding of networks, the modern data deluge has opened up unprecedented opportunities to study and understand the structure and function of social, economic, political and information systems. The concept of networks has become indispensable in the social, information, biological, and physical sciences. Data-driven network science aims at explaining complex phenomena at larger scales emerging from simple principles of network link formation.