A tractor crawler, a motorized vehicle that uses caterpillar tracks instead of wheels to achieve superior floatation and traction. Crawlers are more expensive in maintenance and harder to operate than wheel tractors, but are often critical for working on soft soils, transporting great weights, and especially for bulldozing
(or bot or spider): a program that visits Web pages, on a regular basis, reads their content, follows their links to the other pages in the Web site, then takes the information to the index
A class of robot software that explores the World Wide Web by retrieving a Web document and following the links within that document Based on the information gathered, a crawler creates indices for search engines
also referred to as "spider", "robots", or "bots "it is an automated program, designed by programmers of search engines, to search the Internet looking for new Web sites They also read and scan meta tags
A strike on which the ball misses the head pin So called because the 4, 2, and 1 pins usually fall slowly, like dominos, after the rest of the pins are down
A "crawler" (also referred to as a bot, robot, wanderer, or spider) is a piece of software that "crawls" the Web collecting URLs and other information from Web pages Search engines are built around the information that crawlers retrieve
A crawler is much like a spider except it is programmed to constantly surf the web, following any and all links it comes across As it visits new websites, it checks its own database to see if the site is listed If the site is already listed, it makes note of any changes and calculates a search engine ranking for the site If the site has not been previously listed, the crawler will record all important information, add the website to the database, and assign a ranking to it
A component of a search engine that roams the Web, storing the URLs and indexing the keywords and text of each page encountered Also referred to as a robot or spider
1 A program that automatically fetches Web pages Crawlers (also called spiders) are used to feed pages to search engines Crawlers might request all Web pages at a site during a search; therefore, requests by crawlers are typically excluded from request counts (Usage Import) 2 A program that collects files by following links contained in those files (usually over HTTP) or by following directory trees in a file system (Search, Content Analyzer)
Search engine crawlers or crawlers for short mechanically try to read each page on a web site for adding them to the data base of a search engine such as Google or AltaVista Other varieties exist: there are crawlers which try to extract email addresses for spamming purposes