In fact, this term is more common in foreign and Hong Kong-funded companies. Generally speaking, they are appointed by the company to be responsible for certain customer groups, external affairs, and strive for and follow up business, so they can be said to be "account directors", "customer agents", "sales directors" and even "salesmen" in the sense.
Requirements depend on each company. Generally, cheerful personality, enterprising spirit and positive progress are required; And listen carefully, take the initiative to seek solutions when encountering problems, or give feedback to superiors in time, get along well with others, and so on.
I hope to make it clear.