hi.....................................

Hi ahmed,
thanks for reaching out! Do you mean you're confused about the term distribution function? If you'd like to learn more about distributions, you can take a look at our probability course, here is the link:
https://learn.365datascience.com/courses/probability/course-introduction/

Best,
365 Eli

A probability distribution is a function which shows the probability for each value in the table. For suppose the experiment is throwing a dice, and let p be the probability distribution function, then p(1) will be 1/6. Here for example in normal distribution, the function will show the probability for each value in our data. If you are having doubt that how the graphs for those probability distributions are forming, those graphs are formed when we plot probability of a data point vs the data point.