Euler's number (2.71828...) is the unique value where the exponential function eˣ is its own derivative — meaning at any point on the curve, the rate of change equals the value itself. In other words, e describes a quantity growing at exactly the rate it already is.

You'll find it everywhere: compound interest calculated infinitely often, the decay of radioactive atoms, the spread of a virus, the curve of a hanging chain. Any time nature grows or shrinks smoothly and continuously, e is quietly running the math underneath.

Now, its running the math in the greatest analytics and deal platform in history.