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In in-order traversal (specifically for binary trees), visit the nodes in the following order: left subtree, root, right subtree. For a binary search tree, this gives nodes in ascending order.

Level-order traversal visits the nodes level by level, starting from the root and moving to subsequent levels; typically implemented using a queue.

In post-order traversal, the nodes are visited in the following order: left subtree, right subtree, and then the root. It is useful for deleting the tree or for postfix notation of expressions.

Pre-order traversal visits nodes in the following order: root, left subtree, then right subtree. It's useful for creating a copy of the tree or for prefix notation of expressions.