Social networks are complex systems of individuals, organizations and relationships that interact and influence one another. They can range from structured social networks, such as those found in the workplace or in political networks, to informal networks, such as networks of friends and family. Social networks are dynamic systems and are constantly in a process of change and adaptation as members enter and leave, and as existing relationships become strengthened or weakened. They provide a unique opportunity for understanding social phenomena and relationships between people, as well as a research tool for studying the underlying dynamics of relationships and interactions.

See also: social media, social capital, collective intelligence, network effect