What does SEM mean? What is the responsibility of SEM Commissioner?

Sem Chinese explanation: search engine marketing. (Simple understanding: search engine advertising), some people understand it as a bidding specialist and so on. To put it bluntly, we search for a keyword on Baidu or other search, and merchants buy this keyword, then we may see the advertisements of merchants. (Whether it can be displayed or not, there are other requirements). You can look at the job responsibilities of sem on the recruitment website, where there is a more detailed introduction.