The number e and logarithms are mathematical concepts that are used to describe relationships between numbers.
The number e is a special mathematical constant that is approximately equal to 2.71828. It is used in many areas of mathematics, including exponential growth and decay, and it is also the base of natural logarithms.
A logarithm is a way of expressing how many times you need to multiply a certain number (called the base) to get another number. For example, the logarithm of 1000 with base 10 is 3 because 10 x 10 x 10 = 1000.
So, logarithms help us find the exponent (or power) that we need to raise a certain base to in order to get a particular number. In the example above, the logarithm of 1000 is 3, so we know that 10^3 = 1000.