What is the function of big data crawler technology?

Web Crawler is a free translation of words such as Spider (or Robots, Crawler), and it is an efficient information capture tool. It integrates search engine technology, searches, crawls and saves any HTML (Hypertext Markup Language) standardized webpage information from the Internet through technical means optimization. The mechanism is: send a request to a specific Internet site, interact with the site after establishing a connection, get information in HTML format, then move to the next site and repeat the above process. Through this automatic working mechanism, the target data is saved in the local data for use. When a web crawler accesses a hypertext link, it can automatically obtain address information pointing to other web pages from HTML tags, so it can automatically achieve efficient and standardized information acquisition. With the increasingly extensive application of Internet in human economy and society, the scale of information it covers is growing exponentially, and the form and distribution of information are diversified and globalized. The traditional search engine technology can no longer meet the increasingly refined and specialized information acquisition and processing needs, and it is facing great challenges. Since its birth, web crawler has developed rapidly and become the main research hotspot in the field of information technology. At present, the mainstream web crawler search strategies are as follows.