Greetings,
MBA:
MBA stands for Master of Business Administration. This course is offered only by universities. A college can provide MBA degree if and only if that college is affiliated to a recognized university.
PGDM:
PGDM stands for Post Graduate Diploma in Management. Generally this course is offered by the Institutes or colleges that are not affiliated to any university. PGDM or PGDBM etc are generally the internal courses offered by the college itself.
MBA and PGDM are Equivalent:
The syllabus of both MBA and PGDM are more or less same. Moreover, they are considered as equivalent. So, one can opt for any of the two courses without worrying about its recognition or reputation in Companies.
Regards,
Arjun