Master of Business Administration (MBA) and Post Graduate Diploma in Management (PGDM) both are management courses. But there is slight difference between these two Source<> http://www.edubilla.com/articles/common-category/what-is-the-difference-between-mba-and-pgdm-/

1. What is the difference between
MBA and PGDM?

2. Master of Business Administration (MBA) and Post Graduate
Diploma in Management (PGDM) both are management
courses. But there is slight difference between these two
which has to be understood by the students who prefer to
study these courses. Many of you will get confused on
hearing these terms, some of you might think both are
same and others will think PGDM as a diploma and MBA as a
Master degree.
Here I would like to make you clear about the difference
that lies in MBA and PGDM course. The curriculum and
focus in both the courses vary accordingly.

3. MBA:-
Master of Business Administration(MBA) can only be offered
by the institutions that are affiliated to an university. It
enables you to carryout further studies (E.g M.Phil, PhD
etc.,) in reputed institutes of any country after completion
easily. Theoretical aspects of management are focused
more. MBA helps you in developing your technical skills and
gaining business knowledge. The curriculum of MBA will be
framed by the universities and the change in the same will
be rare.
PGDM:-
Post Graduate Diploma in Management (PGDM) is offered
by autonomous colleges or institutes but it needs to be
recognized by the All India Council for Technical Education
(AICTE). You can do further studies only if the concerned
institute is having accreditation from The Association of
Indian Universities (AIU).

4. PGDM course is industry oriented and helps you to build soft
skills. As the institute that offers this is independent, the
curriculum can be changed according to recent industry
standards and business trends.
PGDM is considered equivalent to MBA when the institute
that offers the course is accredited from AIU and it prepares
you for a senior management position. In general MBA
costs less than PGDM course.
Hope you have understood the exact difference. Now,
choose the one that suits your career.