The "order of operations" is a set of rules that determines the sequence in which mathematical calculations should be performed. This ensures that everyone arrives at the same answer when solving a problem. The common acronym used to remember this order is PEMDAS, which stands for Parentheses, Exponents, Multiplication and Division (from left to right), and Addition and Subtraction (from left to right). When solving a mathematical expression, start by calculating anything inside parentheses. Next, evaluate any exponents. After that, perform all multiplication and division from left to right, followed by addition and subtraction. Following this order helps avoid confusion and ensures accurate results.