Networks are any set of nodes and links Nodes are network participants. Not all nodes are equal in function and importance. Central nodes have a high relative number of links, and marginal nodes have fewer links. Network size can be measured by the total number of nodes in a network, and degree is a measure of the number of links each node has. Links are the connections between nodes in a network. Links vary in terms of directionality, the strength of the connection, and the frequency of activity. Network density is the proportion of links to nodes within a network. Read more about Nodes and Links 13