What is a "broker"? Why is it called "agent"? Why do actors and artists in the entertainment circle generally need "agents"

A broker is a middleman who introduces buyers and sellers to trade in order to get a commission. To put it bluntly, it is an intermediary, but it is much better than an ordinary intermediary. At least, they have to use their brains to help artists. After signing a contract with an artist, a general brokerage company will arrange a reasonable broker for the artist. According to the requirements of brokerage companies and artists, brokers will do a good job in promoting artists, determine roles that are more acceptable to the audience according to their respective characteristics, and introduce them through these roles, and if necessary, package, speculate, hide in the snow, publicize and so on. Let artists enhance their fame and give artists a "wrist". Many people think that it is the agent behind the star who delivers water to the star. Actually, these people are all assistants. The job of a star agent is very complicated. Always consider whether the words and deeds of stars will affect the development of artists. Various advertisements, concerts, attending activities, etc. ; You have to talk through an agent, but artists don't come forward.