An electronic calculator is a small device used to perform mathematical calculations. It can handle basic operations like addition, subtraction, multiplication, and division, as well as more complex functions such as square roots and percentages. Most calculators have a keypad for input and a display screen to show results. These devices come in various types, including scientific calculators for advanced math and graphing calculators that can plot graphs and solve equations. They are widely used in schools, offices, and homes, making calculations faster and more accurate than doing them by hand.