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What is the main difference between Breadth First Search and Best First Search? What is meant by saying Breadth First Search requires previous knowledge?

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    $\begingroup$ Where have you seen that "Breadth First Search requires previous knowledge"? $\endgroup$
    – fontanf
    Jul 19 at 6:07
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In Breadth First Search, nodes are processed by non-decreasing value of their depth, i.e. the next node processed in the unprocessed node with the smallest depth.

In Best First Search, a value is assigned to each unprocessed node. The next node processed is the unprocessed node with the smallest value. Therefore, Breadth First Search is equivalent to a Best First Search where the value assigned to each node is its depth.

From an implementation point of view, Breadth First Search can be implemented with a simple queue while Best First Search will generally require a priority queue.

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