Parent, A node in a tree that has children (left, right or both). ,  Left-child, A node on the left hand side below a parent, Right-child, A node on the right hand side below a parent, Root, The top node in a tree, Subtree, A parent with children within another parent-child relationship, Leaf, A node with no children, Level, Refers to how many generations the node is from the root. The root is on Level 1., Path, The sequence of nodes travelled to get from one node to another along the edges that link them, Traversing, To visit all the specified nodes of the tree in some specified order, Visiting, To arrive at a node for the purpose of performing some operation on the node .

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