SEO (Search Engine Optimization) is a term used when aiming for a higher rank in the ranking of the displayed ranking when a search engine such as Google or Yahoo! is used.
Although it is often treated as a technique for high-level display, the original meaning is to “optimize content for search engines”. The role of the search engine is to match the user’s needs (search) with the desired information (web page).
By posting correct markup that is easy for search engines to understand and high-quality information, SEO can be expected to be effective.