Answer:
A partnership is a mutually beneficial peer relationship. It is fueled by trust, a shared drive to succeed, and the recognition that you can do better together. Your partner is an ally who can serve as a sounding board to broaden your perspective, a collaborator to tackle problems with, and a connector that can help you build out your personal brand and expand your network.
Your partner is not always your work BFF. This relationship is more transactional. You each have an explicit intent to elevate yourselves by elevating each other.