A stack and a queue are both linear data structures, but they differ in their approach to data storage and retrieval.
A stack uses the Last-In-First-Out (LIFO) principle, where the most recent item added to the stack is the first one to be removed. Think of a stack of plates, where you can only add or remove the top plate.
A queue uses the First-In-First-Out (FIFO) principle, where the first item added to the queue is the first one to be removed. Think of a line of people waiting for a ride, where the first person in line gets the first ride.
In summary, a stack allows you to add and remove elements from the top of the stack, while a queue allows you to add elements to the end and remove elements from the front.