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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