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 statistical analysis, and create graphs. Calculators come in various forms, including handheld devices, software applications, and online tools. They are widely used in education, engineering, finance, and everyday life to simplify calculations and improve accuracy. Many smartphones also have built-in calculator functions, making them easily accessible for quick math tasks.