👉 A singletree is a binary tree where each node has exactly two children. This means that the left child of a node and the right child of a node are both stored in separate nodes, which can be quite useful for certain applications. In other words, a singletree allows you to use a single node to store information about all levels of a binary tree without having to create multiple copies of the same data structure. This is especially useful when dealing with large datasets or when you need to