What it's for: Calculates the integral of a function, useful for determining areas under curves, volumes, and other integral calculus concepts.

How it works: It calculates the area under the curve of the function between two given values.

Calculus: Integrate a function between defined limits.

Usage: Useful in physics, engineering and economics to calculate areas, volumes and work.

Formula: Depends on the function (e.g. ∫f(x)dx)