Coaching is the art of raising and maintaining performance...

Per definiton: "Coaching is a persons (the coach) ability to free the potential in the person being coached (PBC) to raise the PBC's performance to the maximum possible level.
We may simply say that coaching is about replacing old unproductive habits with new ones which foster success in the areas where it matters most to you

The ICF Definition of Coaching

The International Coach Federations Definition of Coaching : Professional Coaching is an ongoing professional relationship that helps people produce extraordinary results in their lives, careers, businesses or organizations. Through the process of coaching, clients deepen their learning, improve their performance, and enhance their quality of life.

In each meeting, the client chooses the focus of conversation, while the coach listens and contributes observations and questions. This interaction creates clarity and moves the client into action. Coaching accelerates the client's progress by providing greater focus and awareness of choice. Coaching concentrates on where clients are now and what they are willing to do to get where they want to be in the future, recognizing that results are a matter of the client's intentions, choices and actions, supported by the coach's efforts and application of the coaching process.