Baidu promotion is by baidu inc. (the world's largest Chinese search engine company, after buying the service enterprises, through the register to submit a certain number of keywords, its promotional information will first appear in Internet search results accordingly. Is simply when users use a keyword search, related to the keywords in the search results page of advertising content. Because the keyword advertising is in particular keywords retrieval, to appear in a prominent location in the search results page. Such as: enterprise owner registered in baidu "BGSEM" submitted the keywords, when consumers or users in search of "BGSEM" information, enterprise will give priority to be found, baidu according to the actual clicks (potential customer access number) to collect fees, each effective click fees range from a few cents to several dollars, determined by the competition of enterprise products.