Let's first look at SEM, which refers to online marketing activities that promote websites on search engines, increase website visibility, and thereby bring traffic; such promotion includes SEO search engine optimization and PPC paid search advertising and paid logins, among which the SEO and PPC are the most common. Let’s look at some information related to SEO. We already know that its Chinese translation is search engine optimization , which refers to the internal and external adjustment and optimization of the website on the basis of understanding the natural ranking mechanism of search engines , so as to improve the website’s performance in search engines. The keywords in the website are ranked naturally and get more traffic , so as to achieve the goal of website sales and brand building. In short, the difference between SEO and SEM is that SEO is a marketing method to obtain free traffic through keywords. Compared with paid Latest Mailing Database promotion, it is more difficult to operate. It takes time to slowly accumulate keywords and rankings. It is also search engine marketing. A very important way to bring traffic. SEO and SEM are different, but they are also consistent, that is, the purpose is the same, both for website sales and brand building, but in different ways. SEO is to obtain good natural rankings through technical means; SEM can be achieved through technical means such as SEO and paid means such as PPC. Users can either use only the organic ranking traffic of SEO, or use a combination of the two according to their personal needs. Regarding SEO optimization and promotion, although theoretically, SEM includes SEO and PPC, etc., but there are also many people who directly equate paid traffic promotion with SEM. It can be distinguished by whether or not to pay. In general, the difference between SEO and SEM is mainly a contained relationship. Of course, if some people simply understand SEM as paid search advertising promotion, they are a parallel relationship. But no matter what kind of promotion method is used, website creators must first do a good job of their own content, and then go on marketing and promotion on this basis, in order to achieve twice the result with half the effort.