The expression "(n-m)" represents the mathematical operation of subtraction, where "n" and "m" are variables or numbers. In this context, "n" is the minuend, the number from which another number is subtracted, while "m" is the subtrahend, the number being subtracted. The result of this operation is the difference between the two values. Subtraction is a fundamental arithmetic operation used in various fields, including mathematics, science, and finance. It helps in determining how much more one quantity is compared to another, making it essential for calculations involving budgeting, measurements, and data analysis.