A prenup, or prenuptial agreement, is a legal contract entered into by a couple before marriage that outlines the division of assets and financial responsibilities in the event of divorce or separation. It can address issues such as property rights, spousal support, and debt management. Prenups are designed to protect individual assets and clarify financial matters, helping to reduce conflicts in case the marriage ends. They are often seen as a proactive measure to ensure transparency and fairness in financial dealings.