An account executive is a sales representative. The title is given to members of an organization’s sales staff. These customers or clients, referred to as accounts, are important to the organization's success, and so an account executive is necessary to manage one or more persons dedicated to serving the needs of the transactions and relationships with the customer.
In the advertising industry, account executives are the second-lowest-ranking members of the client service department, outranking only entry-level account coordinators. The word executive here means to execute - that is they are mostly responsible for more practical parts of the advertising jobs (i.e. leaflets, distributions, adaptations of materials from different languages etc).
They answer to the respective account supervisor and/or to the client service director/account director. That depends on the country and on the account you are working for. In
While the designation of account executive involves different responsibilities in different business settings, just about all incarnations of account executives will involve providing an ongoing connection with the clients assigned to the executive. This may involve acting as the advocate for the client with the company, ensuring that the customer is receiving the care promised at the time the business relationship was established.