An undirected graph G=(V,E) consists of a set of vertices (nodes) V and a set of edges E, where each edge is an unordered pair of distinct vertices {u,v}
Connections are bidirectional: if a path exists from u to v, it automatically exists from v to u
Key Properties
Symmetry: {u,v} is identical to {v,u}
Adjacency Matrix: The adjacency matrix is always symmetric