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Expression evaluation: Stacks are commonly used to evaluate mathematical expressions such as infix and postfix expressions, where operators are applied to operands based on the order of precedence.
Backtracking: Stacks are used in algorithms that involve backtracking, such as depth-first search and solving maze problems. The stack stores the sequence of steps taken during the algorithm, allowing for an easy way to revert to a previous step when necessary.
Function calls: In computer programming, stacks are used to store the return addresses of function calls, creating a chain of calls known as the call stack. The call stack is used to keep track of the order of function calls and to return control to the correct function when a function returns.