Label is a classification system. The purpose of TAG is to better display and highlight the key keywords or terms of search, so as to better index and guide users to browse and index. For example, in the past, our classification of web pages only stayed at the level of enterprise news, industry news and latest news. With the application of tag, it is now classified into hot words such as enterprise, industry, category, hotspot, importance and focus, so as to be better. TAG has no unified Chinese name, some are called classification, some are called open classification or popular classification, and some are called tags. Tags are different from the general classification method of directory structure. First of all, TAG can refine classification with less cost. Imagine that an article covering a wide range, such as an article about the achievements of physics since the 20th century, may involve scientists such as relativity, quantum mechanics, black hole theory, Big Bang theory, Einstein, Planck, and even the Nobel Prize. If we use the classification method of directory structure, it is impossible to classify according to all aspects involved in this paper, because refining the classification will make the whole directory structure extremely huge, which is not conducive to the organization and search of materials. On the other hand, labels are different. They can classify articles freely without the restriction of directory structure, and the relationship between tags is parallel. However, according to correlation analysis, tags that often appear together can be correlated to generate a correlation classification. Tags are keyword tags, which can also be said to be keyword tags, which are beneficial to search and search. But TAG is also different from general keywords. When searching with keywords, you can only find the keywords mentioned in the article, and TAG can mark the keywords that are not in the article as tags, such as an article, which can be marked as data or history, or as physics. If you tag the data, you can connect all the informative articles and make it easy to find. Classification label is different from general classification, which is established from bottom to top, and general classification is generally established from top to bottom. The meaning of tags lies in sharing: you can find other people's blogs, web extracts, pictures, files and so on through the same tag. How tags work Using tags on a website can be divided into two parts. The first part is to add labels; The second part is browsing the tags on the website: adding tags to pages or blocks-in the title area at the top of the article, click Add Tags. Browse Tags to Find Content-Click the Tags link to browse all articles with this tag added.