advertising companies are divided into these categories, and different types of advertising companies have different functions. 1. Media agent type: agent or buy out the media of radio stations, newspapers and TV stations, and be responsible for delivering media to customers. This is the most common type of company. 2. Design and production company: shoot professional advertisements, invite spokespersons, and post-produce advertisements. This is more common in big cities. 3. Creative planning company: an advertising company that is responsible for giving ideas, ideas, scripts and planning schemes. Example: The one opened by Ye Maozhong is. 4. Comprehensive advertising companies. Omnipotent, doing everything, but not specialized in anything. This type of advertising company will gradually decrease in the future. I hope my answer will help you, and I hope it will be adopted.