The full name is search engine optimization, which dates back to Yahoo. Yahoo first used page ranking technology. Later, Google founders Larry Page and Sergei brin founded Google on this basis and improved the ranking algorithm by reference.
As the name implies, SEO is a technology of website ranking optimization, which can meet the needs of users when they search for keywords, and your website can appear on the front page or top of the search results page.
This technology needs to constantly study Google search engine preferences, algorithms, and use algorithms to optimize the website, until the website ranks first.