Training and development aims to improve employee performance through increasing skills, knowledge, and changing attitudes. Training focuses on short-term skills for current jobs, while development has a longer-term focus on career growth. There are various methods for assessing training needs, delivering training programs, and evaluating their effectiveness. Training can provide benefits like increased productivity and morale, but also has costs like lost work time. The goal is to close gaps in skills and knowledge through various on-the-job and off-the-job training methods.