The document defines and compares the private, public, and corporate sectors of economics. The private sector consists of organizations owned and managed by private individuals and aims to maximize profits. Examples include TATA and Reliance. The public sector is owned and managed by the government and aims to provide services like police, military, and healthcare. The corporate sector consists of large business organizations and industrial companies that contribute to national income, infrastructure growth, and economic development. The sectors differ in their ownership, management, funding sources, and objectives.