The Special Marriage Act of 1872 and 1954 in Bangladesh and India aimed to provide a form of marriage for people of different religions or those not following major religions. Key provisions include allowing inter-religious and inter-caste marriages, minimum age of 18 for men and 14 for women, consent requirements, prohibiting polygamy and bigamy, and outlining grounds for divorce and provisions for alimony, child custody, and succession of property according to the Indian Succession Act of 1925. The 1954 Act expanded on the 1872 Act and established a self-contained system for solemnizing, registering, and dissolving marriages under its provisions.