Question ambiguous

How do I call a vertex a parent? We are making graph, not a tree? How can there be parent in graph? I do not understand.

@rishabhsetiya7
In Graph theory, a tree is an Undirected, Connected and Acyclic graph. In other words, a connected graph that does not contain even a single cycle is called a Tree.
In graph,Parent means the vertex from which an Edge originates.
Consider a Graph

Here 1,4 are having 0 as their parent.
Now Consider e.g.
4 3
1 2
2 3
2 4
In this graph, we have vertices 1,2,3 and 4.We have egdes between (1,2) ,(2,3),(2,4). Since 1 is the lowest among these, so it becomes the master vertex.

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