Performance appraisals are used to evaluate employee performance in areas such as promotions, training, compensation, and career development. The performance appraisal process involves establishing performance standards, examining work performed, appraising results, and discussing evaluations with employees. However, performance appraisals can be subjective and biased due to factors such as the halo effect, leniency, and recent behavior bias of supervisors. They may also cause anxiety for employees whose opportunities are impacted by the results.