Tree BFS (Breadth-First Search) traversal is a key technique used to explore nodes in a binary tree level by level, starting from the root. This pattern is important because it ensures that each node at a given level is processed before moving on to the next level, making it ideal for solving problems that require a level-wise approach. BFS traversal is particularly useful when we need to understand the structure of a tree or solve problems that rely on the tree's hierarchy, such as finding the shortest path or performing level order operations.