Apart from PGDM, few other certifications such as PGPBM is also available. What is the role of these multiple certifications?

PGDM stands for Post Graduation Diploma in Management. Various management institute offer diploma in management in the country. These institutes name the management program they offer in different ways. Post Graduation Program in Business Management is the same thing as Post Graduation Diploma in Management. Post Graduation Diploma in Management can be of various types like a general MBA program or a program offered in a particular specialization like Post Graduation Diploma in Management (Marketing). Please note that these courses are usually of two years. There is also programs like EPGDM which stands for Executive Post Graduation Diploma in Management which is usually a one year or an weekend programs designed for experienced professionals.