What are key differences between a stack and a queue in the context of data structures? Discuss why recursion uses a stack, and how you would implement a queue using two stacks.

Stacks follow Last In First Out (LIFO) principle which allows the last element added to be the first to be removed, making it suitable for recursion. Queues follow First In First Out (FIFO), allowing the first element added to be the first removed. To implement a queue using two stacks, use one stack for enqueue operations and another for dequeueing, transferring elements when necessary.