Webcrawlers like the Googlebot achieve their purpose of ranking websites in the SERP through crawling and indexing. Significance for search engine optimization The noindex meta tag or the canonical tag serves better for this purpose.
However, that cannot prevent content from being indexed by search engines. If you don’t want certain crawlers to browse your website, you can exclude their user agent using robots.txt. While a crawler mostly deals with metadata that is not visible to the user at first glance, a scraper extracts tangible content. Scraping is, however, a black hat technique, which aims to copy data in the form of content from other sites to place it that way or a slightly modified form of it on one’s own website. Unlike a scraper, a crawler only collects and prepares data. The most well known crawler is the Googlebot, and there are many additional examples as search engines generally use their own web crawlers.
The operations of these computer programs need to be established before a crawl is initiated. It looks for information on the Web, which it assigns to certain categories, and then indexes and catalogues it so that the crawled information is retrievable and can be evaluated. In principle, a crawler is like a librarian. 6 Significance for search engine optimization.