In computer programming, a stack and a queue are both data structures that store collections of elements. The main difference between them is the order in which elements are added and removed. In a stack, the last element added is the first one to be removed, so it follows a Last In First Out (LIFO) order. In contrast, in a queue, the first element added is the first one to be removed, so it follows a First In First Out (FIFO) order.

Stacks are useful when we need to keep track of the order in which elements were added and when we only need to access the most recent addition to the stack. Examples of situations where a stack can be used include managing function calls in a program, undo operations in an application, and managing the web pages visited in a web browser.

Queues are useful when we need to process elements in the order that they were added, like simulating real-life scenarios. Examples of situations where a queue can be used include managing tasks in a printer spooler, handling incoming network requests, and processing customer service requests in a ticketing system.

In summary, when deciding between a stack and queue, consider how the data will be accessed and the order in which elements need to be processed.
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