#### DataStructures / Data structures Interview questions

# What are the different types of binary tree?

A **rooted **binary tree has a root node and every node has at most two children.

A **full **binary tree (proper or plane binary tree) is a tree in which every node in the tree has either 0 or 2 children.

A **Complete** Binary Tree has all levels completely filled except possibly the last level and the last level has all keys as left as possible.

In **Perfect **Binary Tree all internal nodes have two children and all leaves are at same level.

A binary tree is **balanced** if height of the tree is O(Log n) where n is number of nodes.

A **degenerate **(or pathological) tree is a tree where every internal node has one child. Such trees are performance-wise same as linked list.

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