Business management consulting, marketing planning consulting, public relations media consulting, business consulting, what do these companies do? What's the difference and connection?

Enterprise management consulting belongs to comprehensive consulting companies, such as: Peking University Zongheng, Xinhua Xin, Hejun and other consulting companies that started in the 1980s basically belong to this category;

Marketing planning refers to a horizontal consulting company that only does marketing planning and does not do other business; Public relations media, that is the executive level; There are several kinds of business consulting, but they all belong to the investment field;

Contact yo, the contact of these companies, of course, belong to professional service enterprises,