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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. Scrapy - Wikipedia

   en.wikipedia.org/wiki/Scrapy

   Scrapy (/ ˈ s k r eɪ p aɪ / [2] SKRAY-peye) is a free and open-source web-crawling framework written in Python. Originally designed for web scraping, it can also be used to extract data using APIs or as a general-purpose web crawler. [3] It is currently maintained by Zyte (formerly Scrapinghub), a web-scraping development and services company.

4. HTTrack - Wikipedia

   en.wikipedia.org/wiki/HTTrack

   HTTrack is a free and open-source Web crawler and offline browser, developed by Xavier Roche and licensed under the GNU General Public License Version 3. HTTrack allows users to download World Wide Web sites from the Internet to a local computer. [5] [6] By

5. Crawl frontier - Wikipedia

   en.wikipedia.org/wiki/Crawl_frontier

   Architecture of a Web crawler. A crawl frontier is one of the components that make up the architecture of a web crawler. The crawl frontier contains the logic and policies that a crawler follows when visiting websites. This activity is known as crawling.

6. Web scraping - Wikipedia

   en.wikipedia.org/wiki/Web_scraping

   Web scraping is the process of automatically mining data or collecting information from the World Wide Web. It is a field with active developments sharing a common goal with the semantic web vision, an ambitious initiative that still requires breakthroughs in text processing, semantic understanding, artificial intelligence and human-computer interactions.

7. Distributed web crawling - Wikipedia

   en.wikipedia.org/wiki/Distributed_web_crawling

   Distributed web crawling is a distributed computing technique whereby Internet search engines employ many computers to index the Internet via web crawling. Such systems may allow for users to voluntarily offer their own computing and bandwidth resources towards crawling web pages.