agency
The German word for agency is 'Agentur'. It is used to refer to a business or organization that provides a particular service, often on behalf of another business or individual. For example, an advertising agency is called a 'Werbeagentur' in German.
The agency has taken over our marketing.
This is a statement that suggests that a certain agency is now in charge of handling marketing activities for the speaker or the speaker's company.
She works for a big agency in Berlin.
This phrase is indicating that the person in question, a woman, works for a notable or possibly well-known agency situated in the city of Berlin.
We have to pay the agency for their services.
The phrase implies that the agency has offered some services to the speaker or the speaker's company and they now have to pay for those services.