Okay, so I think if 2 vertices are adjacent to each other, they are incident to each other….or do I have it wrong? Is this just different terminology. I thought I was totally clear on this for my class, but now I am doubting myself reading the book and looking at my notes. I just want to know if I have it correct, and if I don’t could someone explain to me what the difference is between the two. I found several wiki’s and different university definitions, but none ever said that the two are alike and I’m confused and would like some reassurance. Thanks in advance.

**Answer**

Usually one speaks of adjacent vertices, but of incident *edges*.

Two vertices are called adjacent if they are connected by an edge.

Two edges are called incident, if they share a vertex.

Also, a vertex and an edge are called incident, if the vertex is one of the two vertices the edge connects.

**Attribution***Source : Link , Question Author : pqsk , Answer Author : Community*