Question

The first node in a binary tree is called the __________.

Short answer

Answer: The first node in a binary tree is called the "root."

Step-by-step solution

Understanding Binary Trees

A binary tree is a data structure in which each node can have at most two child nodes, typically referred to as the left child and the right child. These trees are a widely-used data organization technique in computer science and programming. The structure begins at a single starting point, which is the node we need to identify.

Identifying the First Node in a Binary Tree

The first node in a binary tree is the starting point from which all other nodes in the tree branch out, either to the left or to the right. This node is called the "root" of the tree.

Final Answer

The first node in a binary tree is called the "root."