Build your intuition. Fill in the missing part by typing it in.

A ____ is a widely-used abstract data type that resembles a hierarchical structure. It consists of nodes connected by edges. The topmost node in the tree is called the root, while the nodes at the bottom are called leaves.

Trees provide an organized way of storing and accessing data. They are especially useful when we need to represent hierarchical relationships or perform operations such as searching, insertion, and deletion efficiently.

There are various types of trees, including binary trees, AVL trees, B-trees, and heaps. Each type has its own characteristics and operations associated with it.