Early search engines collected the addresses of resource servers on the Internet, divided the resources they provided into different directories, and then classified them layer by layer.
People who want to find the information they want can enter layer by layer according to their own classification, and then they can finally reach their destination and find the information they want. This is actually the most primitive way, which is only applicable when there is not much information on the Internet.
With the geometric growth of Internet information, a real search engine appears. These search engines know the beginning of every page on the website, then search all the hyperlinks on the Internet and put all the words representing hyperlinks into a database. This is the prototype of the search engine.
disadvantage?
However, due to the working mode of search engines and the rapid development of the Internet, the search results are increasingly unsatisfactory. For example, searching for the word "computer" may result in millions of pages.
This is because the search engine optimizes the search results through the correlation with the website, and the correlation of the website is determined by the formulas such as the position of keywords in the website, the name of the website, and the label. This is why the search results of search engines are numerous and miscellaneous. Due to the development and changes of the Internet, the database in search engines must contain dead links.