It's Grade Point Average. calculated by adding all the numbered grades (A,B,C,D,F) you've received and dividing them by the number of credits you've taken.

CGPA is commulative grade of all semester...its the sum of all semester grade divide by total number of semester

Grade point average It's the average of the grades you get on a given semester. Meaning the sum of grades u get on the courses(A,B,C,D,F) divided by the sum of their individual credit hour.

It is grade point average It is calculated by dividing the sum of (all courses grade value * credit hour) to total credit houre

It's the total average grade from the whole semesters...