What is marketing? Is there a marketing company in Shenzhen?

Marketing refers to the process that an enterprise discovers or excavates the demand of prospective consumers, and promotes and sells products from the creation of the overall atmosphere and the creation of its own product form. The main purpose is to dig deep into the connotation of products and meet the demand of prospective consumers, so as to let consumers know more about products and then buy them. In Shenzhen, as far as I know, there are online interesting new media, Huaying strategy, Rio Tinto marketing and so on.