Logarithm is the inverse function to exponentiation. The logarithm is used to answer the question; how many times we need to multiply a given number by itself to obtain another given number. For example how many times we need to multiply 2 by itself to obtain 8? And the answer is 3. And notation for that example is ㏒28 = 3
Logarithms are being used in many areas in science such as seismography, measuring acidity, measuring sound intensity, to solve complex mathematical problems or to solve statistical problems.
Natural logarithm is a logarithm with base e, where e is transcendental and irrational number, and is approximately equal to 2.71828182845…
Notation of natural logarithm is ㏒ex or ㏑x.
One important property of natural logarithm is that ㏑e = 1.