Answer: Coach
Step-by-step explanation:
Like a coach does in sports, so does a coach do in business. They work closely with employees so that they can bring out the best in them by motivating them, helping them develop their skills and providing feedback and reinforcement so that they can know where to improve upon.
They can either be peers in the company or they can be managers but the bottom-line is that they aim to help employees do their best so that the company benefits as well.