Does IIM provides MBA degree or Diploma?

MBA is a degree, PGDM is a Diploma and there are some courses named like certifications, programmes, etc. They will be what they are described as. It may get a little complicated if you are seeking eligibility requirements. Hence it is always better to read official notifications for such things.

All IIMs offer a two-year full-time Post Graduate Programme in Management (PGP), equivalent to a Master of Business Administration (MBA) degree.