The absolute value of a complex number $z=a+bi$, also called the modulus, is the distance from the origin to the point $(a,b)$ in the complex plane.

The number $z$ can be interpreted as a vector and therefore, its length can be calculated using the Distance Formula.

For example, the absolute value of $3-4i$ is $|3-4i|=\sqrt{3^2+(\text{-}4{)}^2}=5.$