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2. Web crawler - Wikipedia

   en.wikipedia.org/wiki/Web_crawler

   The repository stores the most recent version of the web page retrieved by the crawler. [citation needed] The large volume implies the crawler can only download a limited number of the Web pages within a given time, so it needs to prioritize its downloads. The high rate of change can imply the pages might have already been updated or even deleted.

3. Web scraping - Wikipedia

   en.wikipedia.org/wiki/Web_scraping

   Scraping a web page involves fetching it and extracting from it. Fetching is the downloading of a page (which a browser does when a user views a page). Therefore, web crawling is a main component of web scraping, to fetch pages for later processing. Once fetched, extraction can take place.

4. Web archiving - Wikipedia

   en.wikipedia.org/wiki/Web_archiving

   For example, the results page behind a web form can lie in the Deep Web if crawlers cannot follow a link to the results page. Crawler traps (e.g., calendars) may cause a crawler to download an infinite number of pages, so crawlers are usually configured to limit the number of dynamic pages they crawl.

5. Focused crawler - Wikipedia

   en.wikipedia.org/wiki/Focused_crawler

   A focused crawler is a web crawler that collects Web pages that satisfy some specific property, by carefully prioritizing the crawl frontier and managing the hyperlink exploration process. Some predicates may be based on simple, deterministic and surface properties. For example, a crawler's mission may be to crawl pages from only the .jp domain.

6. Search engine (computing) - Wikipedia

   en.wikipedia.org/wiki/Search_engine_(computing)

   Search engine (computing) In computing, a search engine is an information retrieval software system designed to help find information stored on one or more computer systems. Search engines discover, crawl, transform, and store information for retrieval and presentation in response to user queries. The search results are usually presented in a ...

7. robots.txt - Wikipedia

   en.wikipedia.org/wiki/Robots.txt

   A robots.txt file contains instructions for bots indicating which web pages they can and cannot access. Robots.txt files are particularly important for web crawlers from search engines such as Google. A robots.txt file on a website will function as a request that specified robots ignore specified files or directories when crawling a site.

8. Wayback Machine - Wikipedia

   en.wikipedia.org/wiki/Wayback_Machine

   Wayback Machine. The Wayback Machine is a digital archive of the World Wide Web founded by the Internet Archive, an American nonprofit organization based in San Francisco, California. Created in 1996 and launched to the public in 2001, it allows the user to go "back in time" to see how websites looked in the past.

9. Spider trap - Wikipedia

   en.wikipedia.org/wiki/Spider_trap

   Spider trap. A spider trap (or crawler trap) is a set of web pages that may intentionally or unintentionally be used to cause a web crawler or search bot to make an infinite number of requests or cause a poorly constructed crawler to crash. Web crawlers are also called web spiders, from which the name is derived.