Given random variables

X,Y,…, that are defined on a probability space, the joint probability distribution forX,Y,…is a probability distribution that gives the probability that each ofX,Y,…falls in any particular range or discrete set of values specified for that variable.

en.wikipedia.org/wiki/Joint_probability_distribution

A joint probability distribution shows a

probability distribution for two (or more) random variables.

statisticshowto.datasciencecentral.com/joint-probability-distribution