Final answer:
The role is known as an Account Manager or Customer Success Manager, focusing on customer onboarding, account growth, and client retention.
Step-by-step explanation:
The role described in the question is typically known as an Account Manager or a Customer Success Manager. Such positions are vital in businesses that depend on building strong relationships with their clients. Their responsibilities include onboarding new customers, discovering opportunities for account growth, and implementing strategies to ensure long-term client retention.
They serve as the liaison between a company and its customers, aiming to provide excellent customer support and foster a positive experience to encourage continued partnership.