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Child
A node that is directly connected and one level below another node.
Edge
Connection between two nodes.
Node
A basic unit containing data and one or more pointers.
Parent
A node that has one or more children.
Root
The topmost node of the tree.
Subtree
The portion of the tree rooted at a particular node, consisting of that node together with all of its descendant nodes and the edges connecting them.
Tree traversal
The process of visiting each node in a tree data structure in a specific order.