Another graph type worth mentioning is a tree graph.
A tree graph has two properties.
The first property is that the graph must be connected,
and the second property is that the graph doesn't have any cycles or loops.
The best way to understand what a true graph is is to see some examples.
So, let's have a quiz.
Here are 8 graphs. For each graph, I want you to check the box if it's a tree.