Definition
A logarithm is the inverse operation to exponentiation. It answers the question: "To what power must we raise the base to get this number?" For example, the logarithm base 10 of 100 is 2, because 10² = 100. It's used to simplify complex calculations. It transforms multiplication into addition. Logarithms are fundamental to many scientific and engineering applications. Think of it as undoing an exponent.