Community Detection is a technique used in network analysis to identify groups of nodes that are more densely connected to each other than to the rest of the network. These groups, or communities, can reveal important structures and relationships within complex systems, such as social networks, biological networks, and information networks. The process typically involves algorithms that analyze the connections between nodes, looking for patterns that indicate clusters. By understanding these communities, researchers can gain insights into the behavior of the network, such as how information spreads or how individuals interact within social networks.