An account manager (Sales) is a person in a business who is responsible for the management of the sales and relationship with particular customers. They are usually allocated particular customer accounts, especially key accounts that provide the most business.
Account managers are responsible for working with clients to identify their needs and work out how the company can best meet those requirements, in order that the client does not decide to place business elsewhere. Normally an account manager looks after existing customers (called "farming") and leaves the creation of new accounts to the sales team.
The responsibilities of an account manager vary depending on the nature of the business. The account manager builds client relationship by acting as the interface between the customer service teams and sales teams within a company.