Mentor - an experienced and trusted adviser.
A mentor is a person who can support, advise and guide you. They typically take the time to get to know you and the challenges you're facing, and then use their understanding and personal experience to help you improve.
This relationship is additional to a manager or boss, and benefits from a more personal and confidential structure. Mentors have the potential to become lifelong friends, or the relationship might only last until you've achieved a goal, there's no one size fits all.
The purpose of a mentor is to help you grow as a person and become the best version of yourself.
Qualities of a good mentor: