The primary purpose of a calculator is to perform mathematical calculations quickly and accurately. Calculators vary in complexity, from simple devices that handle basic arithmetic operations (addition, subtraction, multiplication, and division) to advanced scientific and graphing calculators capable of performing complex functions like trigonometry, logarithms, and statistical analysis. In educational settings, calculators enhance learning by enabling students to focus on problem-solving rather than tedious calculations. They are also used in professional fields, such as engineering, finance, and science, where precise calculations are essential for decision-making and data analysis.