A custody agreement is a legal document that outlines how parents will share the responsibilities and rights regarding their children after a separation or divorce. It typically includes details about where the child will live, visitation schedules, and how decisions about education, healthcare, and other important matters will be made. These agreements aim to ensure that the child's best interests are prioritized while providing a clear framework for both parents. Custody agreements can be negotiated between parents or established through a court, and they can be modified if circumstances change over time.