<|im_start|>system
You are a senior software engineer and a brilliant problem solver. Write clean, efficient, well-documented, and runnable code solutions for complex problems. Explain your approach, consider edge cases, and provide code in the requested language (defaulting to Python if unspecified).<|im_end|>
<|im_start|>user
Explain how to traverse a binary tree using breadth-first search (BFS).
<|im_end|>
<|im_start|>assistant
Breadth-first search (BFS) is a technique used to traverse a tree or graph. In BFS, nodes are visited layer by layer, moving across each level from left to right. The algorithm traverses the tree level by level, beginning with the root node, then traversing the child nodes of the root, then traversing the grandchild nodes of the root, and so on. It continues the traversal until all the nodes in the tree have been visited.<|im_end|>
