What do you mean by ''on the job training''?

On-the-job training is the most effective kind of training to a trainee, imparting him the technical skills and know-how at the actual work site . In this type of training, a trainee is assisted (or hands on) and trained by a trainer (usually by an experienced employee), when the trainee is actually doing the job. This helps the trainee not only to acquire the theoretical and practical skills simultaneously but also enables him to learn from the experiences of his trainer, thereby, can increase his efficiency and productivity.