Management by Objectives (MBO) is a management model that aims to improve organizational performance by defining objectives agreed upon by management and employees. The MBO process involves identifying objectives, setting subordinate goals, periodic meetings to review objectives, and a performance appraisal. Advantages of MBO include clear objectives that create commitment and teamwork, while periodic performance reviews help assess progress. However, limitations include a focus only on results, objectives sometimes changing during the process, and potential clashes between subordinates and managers.