Tree serialization can be achieved using different traversal orders such as pre-order, in-order, post-order, and level-order.

• Pre-order Traversal: In this method, the root node is processed first, followed by the left subtree, and then the right subtree. Serialization using pre-order involves storing the node value, then recursively serializing the left and right children. If a node does not exist, a special character like "#" is used to represent it.

• Post-order Traversal: This method processes the left subtree first, followed by the right subtree, and then the root node. Similar to pre-order, a special character like "#" is used to represent non-existent nodes.

• In-order Traversal: In this method, the left subtree is processed first, followed by the root node, and then the right subtree. However, in-order traversal alone is not sufficient for deserialization because it does not provide enough information to reconstruct the tree structure.

• Level-order Traversal: This method processes nodes level by level, starting from the root. It is particularly useful for complete binary trees, where the first node is the root, the next two nodes are the children of the root, and so on.
  Each of these methods has its own advantages and is suitable for different types of trees and specific requirements.