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Googlebot is the web crawler software used by Google that collects documents from the web to build a searchable index for the Google Search engine. This name is actually used to refer to two different types of web crawlers: a desktop crawler (to simulate desktop users) and a mobile crawler (to simulate a mobile user).
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.
The donated data helped Common Crawl "improve its crawl while avoiding spam, porn and the influence of excessive SEO." [11] In 2013, Common Crawl began using the Apache Software Foundation's Nutch webcrawler instead of a custom crawler. [12] Common Crawl switched from using .arc files to .warc files with its November 2013 crawl. [13]
Google and Yahoo use thousands of individual computers to crawl the Web. Newer projects are attempting to use a less structured, more ad hoc form of collaboration by enlisting volunteers to join the effort using, in many cases, their home or personal computers.
A robots.txt file contains instructions for bots indicating which web pages they can and cannot access. Robots.txt files are particularly important for web crawlers from search engines such as Google. A robots.txt file on a website will function as a request that specified robots ignore specified files or directories when crawling a site.
[11] [12] Google has a Sitemaps program to help webmasters learn if Google is having any problems indexing their website and also provides data on Google traffic to the website. [13] Bing Webmaster Tools provides a way for webmasters to submit a sitemap and web feeds, allows users to determine the "crawl rate", and track the web pages index status.