Final answer:
Professional development is the process of acquiring and strengthening competencies for on-the-job performance. It includes learning job-specific and transferable skills through training and development opportunities.
Step-by-step explanation:
Professional development is the process that acquires and strengthens competencies needed to maintain, improve, or expand on-the-job performance. It involves investing time to learn job-specific skills, refining transferable skills, and participating in training and development opportunities. By continuously developing and upgrading skills, individuals can stay current in their field and enhance their overall job performance.