Union contracts, also known as prenuptial agreements, are legal documents that outline the rights and responsibilities of two parties entering into a union. These contracts are typically used in marriages, but can also be used in business partnerships or other types of unions. They are designed to protect both parties in the event of a dispute or dissolution of the union. The terms of the contract are negotiated between the two parties and can cover a variety of topics, such as division of assets, spousal support, and child custody.