A business manager is responsible for managing the overall business and financial operations of an organization's functional units. However, business managers also manage entities that are not companies, such as actors, athletes and musicians.
In a company, this type of manager's focus is to make sure the employees in all of the different divisions and departments are producing output and profit that is in alignment with organizational goals and objectives.
Outside of the corporate world, business managers may have numerous contacts because many are former agents. This makes them appealing to entertainment people like actors who want to hire them for their connections, perhaps to land a bigger, better agent. As they do for companies, managers oversee all aspects of these individuals' business affairs.