The natural logarithm function ln(x) returns the exponent you need to raise Euler's number (e ≈ 2.71828) to in order to get x. It is the inverse function of e^x.
A function that 'undoes' another function. Applying an inverse function cancels out the effect of the original function.
Logarithm: A mathematical operation that calculates how many times a number (base) must be multiplied by itself to obtain another number.
Domain and Range: The set of all possible input values (x-values) for a function is called its domain, while the set of all possible output values (y-values) is called its range.