Social networks
The defining feature of social networks is that nodes represent people. The networks themselves can represent anything from small informal friend groups to entire societies.
Edges in a social network represent a type of relationship between people. Often, this relationship is friendship or communication. However, it can also be something as abstract as the similarity in their video streaming behavior. Just imagine; you might never have met someone, but you could be the only two people in the world who enjoy watching videos of sleeping hippos. That is certainly a kind of relationship!
Many of the tools of network science come from the study of social networks in sociology. The sociologists, Jacob L. Moreno and Helen Hall Jennings, ...
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