A calculator is a device used to perform mathematical calculations. It can handle basic operations like addition, subtraction, multiplication, and division. More advanced calculators, such as scientific or graphing calculators, can solve complex equations, perform trigonometric functions, and graph mathematical functions. Calculators come in various forms, including handheld devices, software applications, and online tools. They are commonly used in schools, offices, and homes to assist with tasks ranging from simple arithmetic to complex engineering calculations. The invention of the calculator has greatly improved efficiency in mathematics and science, making calculations faster and more accurate.