Connectivity (graph theory)

Graph Theory is a way of looking at how things are connected. It looks at how things (called nodes) can be connected to each other (called edges). For example, a group of friends can be seen as a graph because each person is a node and the lines between them are the edges that show how they are connected. Graphs can help us answer questions like, how many friends does person A know? How can we get from person A to person C?