The marriage contract written in a prescribed form with decorative borders outlining the obligations mainly of the husband to the wife. It is signed by two witnesses. It is the main way of three ways that a man takes a wife -- by contract, by giving a gift (a ring) or by consummation of the marriage the latter witnessed only by inference.
A ketubah is a Jewish marriage contract. It states that the husband commits to provide food, clothing and companionship to his wife, and that he will pay a specified sum of money if he divorces her. If he dies and leaves her as a widow, she can collect the Ketubah money from his estate.