👉 A semidigraph, also known as a semidefinite graph, is a type of graph that can be represented by a list of edges in which each edge is either part of an edge or not. This means that the edges are both connected and disconnected at the same time but have no loops. Semidigraphs are useful for representing complex networks where the number of nodes (vertices) and edges (links between them) can be very large, such as in biological systems or social networks.