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Web crawler. A Web crawler, sometimes called a spider or spiderbot and often shortened to crawler, is an Internet bot that systematically browses the World Wide Web and that is typically operated by search engines for the purpose of Web indexing (web spidering). [1]
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.
The most widely used type of search engine is a web search engine, which searches for information on the World Wide Web. A search engine normally consists of four components, as follows: a search interface, a crawler (also known as a spider or bot), an indexer, and a database.
A spider web, spiderweb, spider's web, or cobweb (from the archaic word coppe, meaning "spider") [ 1 ] is a structure created by a spider out of proteinaceous spider silk extruded from its spinnerets, generally meant to catch its prey. Spider webs have existed for at least 100 million years, as witnessed in a rare find of Early Cretaceous amber ...
"[N]o web crawler may actually crawl the entire reachable web. Due to infinite websites, spider traps, spam, and other exigencies of the real web, crawlers instead apply a crawl policy to determine when the crawling of a site should be deemed sufficient. Some websites are crawled exhaustively, while others are crawled only partially". [36]
v. t. e. Search engine optimization (SEO) is the process of improving the quality and quantity of website traffic to a website or a web page from search engines. [1][2] SEO targets unpaid traffic (known as "natural" or "organic" results) rather than direct traffic or paid traffic. Unpaid traffic may originate from different kinds of searches ...
none. Launched. April 20, 1994; 30 years ago (1994-04-20) Current status. Active. WebCrawler is a search engine, and one of the oldest surviving search engines on the web today. For many years, it operated as a metasearch engine. WebCrawler was the first web search engine to provide full text search. [1]
[20] [21] It becomes the first popular search engine on the Web. [19] However, it is not a true Web crawler search engine. New search engine: Search.ch is launched. It is a search engine and web portal for Switzerland. [22] New web directory: LookSmart is released. It competes with Yahoo! as a web directory, and the competition makes both ...