On-the-job training is any educational format that is based on training provided at the workplace. This training can be anything from time to think on work problems and/or use related learning resources and up to one-on-one mentoring.
According to Managing Quality by Foster (6th edition),
- On-the-job training. Training that an employee receives at work during the normal workday.
According to the HRBoK Guide,
- On-the-job training (OJT). Receiving instruction while working. Acquiring knowledge, practical skills, and competencies while engaged in daily work.