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2. Web crawler - Wikipedia

   en.wikipedia.org/wiki/Web_crawler

   A Web crawler starts with a list of URLs to visit. Those first URLs are called the seeds.As the crawler visits these URLs, by communicating with web servers that respond to those URLs, it identifies all the hyperlinks in the retrieved web pages and adds them to the list of URLs to visit, called the crawl frontier.

3. robots.txt - Wikipedia

   en.wikipedia.org/wiki/Robots.txt

   robots.txt is the filename used for implementing the Robots Exclusion Protocol, a standard used by websites to indicate to visiting web crawlers and other web robots which portions of the website they are allowed to visit. The standard, developed in 1994, relies on voluntary compliance. Malicious bots can use the file as a directory of which ...

4. 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 ...

5. Common Crawl - Wikipedia

   en.wikipedia.org/wiki/Common_Crawl

   Common Crawl is a nonprofit 501 (c) (3) organization that crawls the web and freely provides its archives and datasets to the public. [1][2] Common Crawl's web archive consists of petabytes of data collected since 2008. [3] It completes crawls generally every month. [4] Common Crawl was founded by Gil Elbaz. [5]

6. Web scraping - Wikipedia

   en.wikipedia.org/wiki/Web_scraping

   Newer forms of web scraping involve monitoring data feeds from web servers. For example, JSON is commonly used as a transport mechanism between the client and the web server. There are methods that some websites use to prevent web scraping, such as detecting and disallowing bots from crawling (viewing) their pages.

7. 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.

8. 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. [1] 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 ...

9. Formication: Anxiety, Menopause, Treatment, Causes, at Night

   www.healthline.com/health/formication

   Formication is the feeling of insects crawling across or underneath your skin. The name comes from the Latin word “formica,” which means ant. Formication is known as a type of paresthesia ...