Object-Oriented Analysis and Design (OOAD) is the process of identifying and modeling objects, classes, and their relationships to solve a particular problem. It focuses on decomposing a system into smaller, manageable modules and creating models that accurately represent the system's behavior, functionality, and structure. OOAD is a specialized skill that requires a deep understanding of object-oriented programming concepts and design patterns. It is used in software engineering to create robust and maintainable software systems that meet the stakeholder's requirements. OOAD involves several stages, including requirements gathering, analysis, design, implementation, and testing, and requires strong communication skills and collaboration among stakeholders and team members.