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Calculators are electronic devices that perform mathematical calculations. They can range from simple pocket calculators that handle basic arithmetic operations like addition, subtraction, multiplication, and division to more advanced scientific and financial calculators that can perform complex calculations like trigonometry, statistics, and calculus. The first mechanical calculator was invented in the 17th century, and electronic calculators became popular in the mid-20th century. Today, calculators are widely used in industries like finance, science, engineering, and education, and can be found in many forms, including handheld calculators, desktop calculators, smartphone apps, and even web-based calculators. Many calculators now also include additional features like conversion functions, memory storage, and graphing capabilities. Some calculators are also specialized for specific purposes, such as tax calculators, loan calculators, or currency converters.