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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. 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.

4. Search engine scraping - Wikipedia

   en.wikipedia.org/wiki/Search_engine_scraping

   This is a specific form of screen scraping or web scraping dedicated to search engines only. Most commonly larger search engine optimization (SEO) providers depend on regularly scraping keywords from search engines to monitor the competitive position of their customers' websites for relevant keywords or their indexing status.

5. 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.

6. Crawl frontier - Wikipedia

   en.wikipedia.org/wiki/Crawl_frontier

   This activity is known as crawling. The policies can include such things as which pages should be visited next, the priorities for each page to be searched, and how often the page is to be visited. [citation needed] The efficiency of the crawl frontier is especially important since one of the characteristics of the Web that make web crawling a ...

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.