What is Crawling?

Crawling, as Google wrote, is the process of finding new or updated pages to add to Google (Google crawled my website). One of the Google crawling engines crawls (requests) the page. The terms “crawl” and “index” are often used interchangeably, although they are different (but closely related) actions. Every time you search, there are thousands, sometimes millions, of web pages with helpful information. How Google figures out which results to show starts long before you even type, and is guided by a commitment to you to provide the best information. Check here

 Google organizes information about webpages in their Search index.

The index is like a library, except it contains more info than in all the world’s libraries put together.


Crawling is the process by which Googlebot discovers new and updated pages to be added to the Google index. We use a huge set of computers to fetch (or “crawl“) billions of pages on the web. The program that does the fetching is called Googlebot (also known as a robot, bot, or spider).

by Google

The fundamentals of Search

The crawling process begins with a list of web addresses from past crawls and sitemaps provided by website owners. As Google’s crawlers visit these websites, they use links on those sites to discover other pages. The software pays special attention to new sites, changes to existing sites and dead links. Computer programs determine which sites to crawl, how often and how many pages to fetch from each site.

Google offer webmaster tools to give site owners granular choices about how Google crawls your site: you can provide detailed instructions about how to process pages on your sites, can request a recrawl or can opt out of crawling altogether using a file called “robots.txt”. Google never accepts payment to crawl a site more frequently, but provide the same tools to all websites to ensure the best possible results for our users.

The web is like an ever-growing library with billions of books and no central filing system. Google use software known as web crawlers to discover publicly available web pages. Crawlers look at web pages and follow links on those pages, much like you would if you were browsing content on the web. They go from link to link and bring data about those webpages back to Google’s servers.

When crawlers find a webpage, Google’s systems render the content of the page, just as a browser does. They take note of key signals — from keywords to website freshness — and they keep track of it all in the Search index.

The Google Search index contains hundreds of billions of web pages and is well over 100,000,000 gigabytes in size. It’s like the index in the back of a book — with an entry for every word seen on every webpage we index. When Google index a web page, they add it to the entries for all of the words it contains.

With the Knowledge Graph, Google continuing to go beyond To do this, they not only organize information about web pages but other types of information too. Today, Google Search can help you search text from millions of books from major libraries, find travel times from your local public transit agency, or help you navigate data from public sources like the World Bank. keyword matching to better understand the people, places and things Google searchers care about.

Search algorithms

In a fraction of a second, Google’s Search algorithms sort through hundreds of billions of webpages in their Search index to find the most relevant, useful results for what you’re looking for. With the amount of information available on the web, finding what you need would be nearly impossible without some help sorting through it. Google ranking systems are designed to do just that: sort through hundreds of billions of webpages in Google Servers Search index to find the most relevant, useful results in a fraction of a second, and present them in a way that helps you find what you’re looking for. These ranking systems are made up of not one, but a whole series of algorithms. To give you the most useful information, Search algorithms look at many factors, including the words of your query, relevance and usability of pages, expertise of sources, and your location and settings. The weight applied to each factor varies depending on the nature of your query, for example, the freshness of the content plays a bigger role in answering queries about current news topics than it does about dictionary definitions.

To help ensure Search algorithms meet high standards of relevance and quality, Google have a rigorous process that involves both live tests and thousands of trained external Search Quality Raters from around the world. These Quality Raters follow strict guidelines that define our goals for Search algorithms and are publicly available for anyone to see.

Rigorous testing

Google goal is always to provide you the most useful and relevant information.

Any changes Google make to Search are always to improve the usefulness of results you see. That’s why they never accept payment from anyone to be included in search results. Search engines has changed over the years to meet the evolving needs and expectations of the people who use Google. From innovations like the Knowledge Graph, to updates to Google’s ranking algorithms that ensure the company continuing to highlight relevant content, and their goal is always to improve the usefulness of your results.

Google’s engineers have many ideas for ways to make your results more useful. But they don’t go on a hunch or an expert opinion. They rely on extensive testing and have a rigorous evaluation process to analyze metrics and decide whether to implement a proposed change. Data from these evaluations and experiments go through a thorough review by experienced engineers and search analysts, as well as other legal and privacy experts, who then determine if the change is approved to launch. 

Google 2018, ran over 654,680 experiments, with trained external Search Raters and live tests, resulting in more than 3234 improvements to Search.

Google Engineering

-Search Quality Tests

-Side by Side Experiments

-Live Traffic Experiments


Google Ads

Google’s commercial relationships have no impact on algorithmic Search changes, and partner advertisers do not receive special treatment in resolving organic search issues or requests. Google make sure these issues are handled based on the importance and impact to users, and not due to a financial relationship with Google.

Google’s mission is to organize the world’s information and make it universally accessible and useful.

Search results in helpful ways

To help you find what you’re looking for quickly, Google provides results in many useful formats. Whether presented as a map with directions, images, videos or stories, the engineers constantly evolving with new ways to present information.

Larry Page once described the perfect search engine as understanding exactly what you mean and giving you back exactly what you want. 


Thousands of engineers and scientists are hard at work refining Google’s algorithms and building useful new ways to search.

– The Knowledge Graph

– Directions and traffic

– Direct results

– Featured snippets

– Featured snippets

– Discover

Maximize access to information

Google is committed to a free and open web, in open access to information, and try hard to make information from the web available to everyone. That’s why Google do not remove content from search results, except in very limited circumstances, including legal removals, a violation of their webmaster guidelines, or at the request of the webmaster who is responsible for the page.

Upon Request, you can ask to remove content from the web just you need to apply here

Happy Crawling !

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