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What Is Tree?
Tree Data Structure
A tree is a hierarchical data structure with a root node and child nodes forming parent-child relationships. Each node has zero or more children, and there's exactly one path between any two nodes. Trees model file systems, HTML DOM, organizational charts, and database indexes.
How Tree Works
File system: root (/) → home → user → documents → file.txt. HTML DOM: html → body → div → p → text. Binary Search Tree: sorted data with O(log n) lookup, insertion, and deletion. Database B-trees: indexes that enable fast queries on billions of rows.
Key Concepts
- Root — The topmost node — every tree has exactly one root
- Parent/Child — Each node (except root) has one parent; nodes can have zero or more children
- Leaf — A node with no children — the endpoints of the tree
- Depth/Height — Depth: distance from root to a node. Height: longest path from a node to a leaf
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Frequently Asked Questions
Trees vs graphs?
Trees are a special type of graph: connected, acyclic, with one root. Graphs can have cycles, multiple components, and no root. Trees model hierarchies; graphs model networks.