What is a key difference between BFS and DFS?

BFS uses a stack, DFS uses a queue.
BFS explores nodes level by level, DFS explores as far as possible along a branch.
BFS is faster than DFS.
DFS is always more memory efficient than BFS.

What is a key difference between BFS and DFS?

Step 1: Understand that BFS stands for Breadth-First Search.
Step 2: Know that BFS explores all the nodes at the present depth level before moving on to the nodes at the next depth level.
Step 3: Understand that DFS stands for Depth-First Search.
Step 4: Know that DFS explores as far down a branch as possible before backtracking to explore other branches.
Step 5: Remember that BFS uses a queue to keep track of nodes to explore next, while DFS uses a stack (or recursion).

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