Difference between probability density function and mass function

Question

Accepted Answer

Probability density function is for continuous random variables while mass function is for discrete random variables.

Probability density function gives the probability of a continuous random variable taking a certain value within a range.
Mass function gives the probability of a discrete random variable taking a certain value.
Probability density function integrates to 1 over the entire range of the random variable.
Mass function sums to 1 over all possible values of the random variable.
Probability density function can take on any non-negative value.
Mass function can only take on non-negative integer values.

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