A 360-degree appraisal is a comprehensive performance review method where an employee receives feedback from multiple sources, including supervisors, peers, subordinates, and sometimes, external stakeholders like customers. This feedback is used to provide a well-rounded view of the employee's strengths and areas for improvement. The process promotes self-awareness, enhances communication, and supports personal and professional development. By incorporating diverse perspectives, 360-degree appraisals help organizations make informed decisions about talent management and foster a culture of continuous improvement.