Breadth-first traversal is an algorithm for traversing tree and graph data structures that visits each level of the tree from left to right before moving on to the next level. It uses a queue to keep track of nodes to visit, following the FIFO principle of adding nodes to the back of the queue and removing from the front. The algorithm starts with a root node, adds its neighbors to the back of the queue, then removes the front node and adds its unvisited neighbors until the queue is empty, ensuring all nodes at each level are visited before moving deeper.
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