Both types of written, legal agreements between two people who intend to bind their lives together. Domestic partner agreements are between two adults who don't intend to marry each other. Such agreements define what happens to property and support if their relationship ends or one dies. In contrast, marriage contracts are between two people who plan to marry or are married. If signed before they marry, such agreements are called prenuptial agreements, prenuptial agreements, or antenuptial agreements.  But if the couple signs such agreements after they marry, they're called postnuptial agreements or, if they're divorcing or separating, marital settlement agreements. With limited exceptions, such as for temporary support, valid marriage contracts override the spouses' property and support rights and obligations under Florida divorce law. But domestic partnership agreements typically fill in what Florida law otherwise leaves silent and undefined.