The 1973 Constitution of Pakistan, introduced by Prime Minister Zulfikar Ali Bhutto, is a written document comprising 12 parts and 7 schedules. It establishes Pakistan as an Islamic Republic with a parliamentary system, guarantees fundamental rights, and delineates a federal structure while emphasizing provincial autonomy. Key features include an independent judiciary, a bicameral legislature, limited presidential powers, and a rigid amendment process requiring a two-thirds majority in parliament.