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One common application of stacks is in the implementation of ___. In this representation, an expression is first converted into a postfix notation. Then, the postfix notation can be evaluated efficiently using a stack. The stack is used to store the operands and intermediate results of the expression evaluation. The process involves scanning the postfix notation from left to right. Whenever an operand is encountered, it is pushed onto the stack. When an operator is encountered, the top two operands from the stack are popped and the operator is applied to them. The result is then pushed back onto the stack. This process continues until the entire postfix notation is scanned and the final result is obtained from the stack.