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Web Crawler

Last updated: May 09, 2022

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Web crawlers function to download and index content from across the Internet. The purpose of the bots is to learn every page on the web so that the information can appear in the SERPs for users. Crawlers are also known as spiders or search engine bots

It's called "web crawler" because "crawl" is a technical term for accessing websites and obtaining data through software programs automatically.

How Crawler Works

Web crawler bots start indexing from seed, or list of known URLs. They "crawl" web pages at the URL first. When the bot crawls the web page, it will find a hyperlink to another URL, and it will be added to the list of pages that will be explored next.

List of active Web Crawlers on the Internet

Crawler bots from several leading search engines, namely:

Google: Googlebot (there are actually two crawlers, Googlebot Desktop, and Googlebot Mobile, for desktop and mobile search)
Bing: Bingbot
Yandex (Russian search engine): Yandex Bot
Baidu (Chinese search engine): Baidu Spider

There are also many less common web crawler bots, some of which are not related to any search engine.

Web Crawlers and SEO

SEO stands for search engine optimization and is a strategy for preparing content for search engine indexing so that the website can appear on the main page in the SERP.

If spider bots do not crawl the website, the website or content page would not be indexed, and certainly will not appear in search results. Therefore, if the website owner wants to get organic traffic from search results, they should not block this bot.

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