Unrooted binary tree

A unrooted binary tree is like a family tree. It is a way of showing how different things are connected or related to each other. For example, if you wanted to know how different types of animals are related, you could use a unrooted binary tree. Every animal would be represented by an dot or circle and lines would connect the dots together. The lines show how one animal is related to another. For example, a lion could be related to a tiger by having a line connecting them. The lines and dots make up the unrooted binary tree.