Logarithms is another way of writing exponents.

a is the argument, b is the base

Natural logs and common logs: 

Natural logs have the base e(2.71828182846...)

common logs (log(x)) have the base 10

Natural logarithms are called Ln(x)

EXAMPLES:

log(0.01)=-2

RULES OF LOGS:

log base 1=0

log base a a=1

LOGARITHM FUNCTIONS:

The shape of log functions look like have curves.