Quick Answer: Marriage, also called matrimony or wedlock, is a culturally and often legally recognised union between people called spouses. It establishes rights and obligations between them, as well as between them and their children, and between them and their in-laws. It is nearly a cultural universal, but the definition of marriage varies between cultures and religions, and over time. Typically, it is an institution in which interpersonal relationships, usually sexual, are acknowledged or sanctioned. In some cultures, marriage is recommended or considered to be compulsory before pursuing sexual activity, and sexual intercourse with others aside from one's spouse may be considered immoral or even illegal in some jurisdictions. A marriage ceremony is called a wedding, while a private marriage is sometimes called an elopement. Marriage takes many forms, depending on cultural and religious values of the people involved and the cultural expectations of the society in which they are living.