Human resource development (HRD) involves systematic activities designed by organizations to provide employees with necessary skills. It emerged in response to needs beyond training, including coaching and career development. HRD is one function of human resource management and includes training and development, organizational development, and career development. Effective HRD requires assessing needs, designing interventions, implementing programs, and evaluating impact. It also depends on strategic alignment and the supervisor's role in on-the-job training.