Adepartment within an advertising agency staffed with different levels of managers who serve as a liaison between agency and client.

Account Management

Explanation:

According to my research on different business roles and responsibilities, I can say that based on the information provided within the question the department being defined is called Account Management. like mentioned in the question this department focuses on managing sales and relationships with individual customers or clients of the business that they work for. This is done in order to maintain or grow their company-client relationships.

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