What is semantic and semantic?

What is semantic and semantic?
Semantics refers to formatting document content with a reasonable HTML Tag and its unique attributes. In layman's terms, semantics is to process data and information so that machines can understand it. semantic HTML documents help improve the usability of your website to visitors, such as using PDAs, text browsers, and people with disabilities. For search engines or crawler software, it is helpful to index them and may give a higher weight. In fact, the most effective method is to reconstruct the HTML structure of a webpage, which is essentially semantic. Based on the structure of the content, select appropriate labels to facilitate developers to read and write more elegant code.