This document discusses different types of enterprises including private, public, global, and mixed enterprises. It provides details on various forms of public enterprises like departmental undertakings, statutory corporations, and government companies. It outlines their merits and demerits. The document also discusses multinational companies, joint ventures, and public-private partnerships. Finally, it summarizes changes in the role of the public sector in India since 1991 including reducing industries reserved for public sector and disinvestment of public sector shares.