BRD, or Business Requirements Document, is a formal document that outlines the requirements and expectations for a specific project or product. It serves as a guide for stakeholders, including project managers, developers, and clients, ensuring everyone has a clear understanding of the project's goals and deliverables. The BRD typically includes sections on project objectives, scope, functional requirements, and any constraints or assumptions. By detailing these elements, the BRD helps to minimize misunderstandings and provides a foundation for further project planning and execution, ultimately contributing to the project's success.