Also known as: CDF
CDF, or cumulative distribution function, is a function that gives the probability that a random variable is less than or equal to a specified value. It summarizes a distribution by accumulating probability up to each point.
A function that defines the frequency of samples less than or equal to a target value. For example, consider a normal distribution of continuous values. A CDF tells you that approximately 50% of samples should be less than or equal to the mean and that approximately 84% of samples should be less than or equal to one standard deviation above the mean.