Unlike linked list and array which can only be traversed linearly, there are several ways to traverse a binary tree. The tree traversal algorithms are mainly divided into two parts,

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**depth first**and**breadth first**. As their name suggests, in depth first, the tree is traversed downwards (towards the depth) before the next sibling is visited, the**PreOrder**,**InOrder**and**PostOrder**traversal of a binary tree are actually depth-first traversals. On the breadth first, the entire breadth of the tree is traversed before moving to next level, hence it is also known as level order traversal. There are other algorithms to traverse a binary tree as well e.g. Monte Carlo tree search, which concentrates on analyzing the most promising moves, but the pre-order, post-order, and in-order traversal are the most popular ways to traverse a binary tree in Java. They are also the most popular data structure and algorithm questions at beginner and intermediate level.
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