In the context of trees, a level refers to the position of a node in the hierarchy of the tree structure, starting from the root node, which is considered to be at level 0. Each subsequent layer down from the root increases the level by one, so children of a node at level n are at level n+1. Understanding levels is crucial for grasping tree properties and traversals, as they help determine the depth of nodes and influence how trees are navigated.
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