What Happens When Search Engine Crawlers Index? - Nummero

If you’ve ever wondered how search engines locate your website, the solution is simple: crawlers. 

Search engine crawlers examine the structure of your material and return

it to be indexed to replicate how human visitors interact with your website.

When you design your website to make it easy for these bots to access and digest crucial information,

you’re not just improving your website’s ranking;

you’re also creating a smooth experience for human visitors.

The crawling process was briefly discussed in How Do Search Engines Work? 

The Guide to Understanding Search Engine Algorithms is a good place to start,

but we’re going a step farther here. 

This article delves into the core operation of web crawlers, breaking down the

many sorts of crawlers you’ll come across, how they work, and what you can do to optimize your site for them.

Finally, it is each crawler’s responsibility to learn as much as possible about what your website has to offer. 

Making that procedure as efficient as possible guarantees

that you are constantly showing the most up-to-date material in the SERP.

What Is a Crawler in a Search Engine?


Search engine crawlers, often known as bots or spiders,

are automated programs that search engines employ to evaluate the content of your website. 

They routinely explore the internet, guided by advanced algorithms,

to access current web pages and discover new material. 

When web crawlers collect data from your website, they send it to their various search engines for indexing.

Crawlers examine the HTML, internal linkages,

and structural aspects of each page on your website during this process. 

This data is then compiled and developed into a thorough picture of what your website has to offer.

How Do Crawlers in Search Engines Work?


These bots are sent out by search engines regularly to crawl and recrawl your site. 

When a crawler visits your site, it does it systematically,

according to the rules and structures provided in your robots.txt file and sitemap. 

These components tell the crawler which pages to look at and which to avoid,

and they provide up-to-date information about the structure of your site.

The first thing a crawler looks at when it visits your website is your robots.txt file. 

This file specifies which portions of your website should be crawled and which should not.

If you don’t put this up correctly, crawling your site will be difficult, and indexing will be impossible.

Allow and deny are the two key functions to pay attention to in the robots.txt file:

Setting a URL to allow indicates

that web spiders will return to index it.

When you set a URL to prohibit, the web crawler ignores it.

The bulk of the material you publish should be set to allow

only private sites containing personal information, such as user accounts or team pages, should be disregarded.

Here’s an example of how to format this file:


User-agent: [the web crawler’s name]

Allow: [URL strings that you want to be crawled]

Allow: [URL strings you do not want crawling]

Once you’ve defined which portions of your website web crawlers may access,

they’ll go through your content and link structure to interpret your website’s core infrastructure. 

Crawlers evaluate your sitemap to make the process more effective.

A sitemap is an XML file that includes a list of all the URLs on your website. 

It offers a structural analysis of each page

and directs the search engine crawler as fast and effectively as possible across your site. 

Your sitemap may also be used to provide priority to specific pages of your website,

indicating to the crawler which material you believe is most important.

By doing so, you’re instructing search engines to increase the perceived relevance of your ranking.

Consider web crawlers to be cartographers

or explorers tasked with charting every nook and cranny of a freshly found landmass. 

Their journey may look something like this:

Crawlers begin their adventure by searching on a search engine.

They explore every nook and cranny of the internet in quest of data (websites) to populate their map.

The crawler explores your site’s content using

the robots.txt and sitemap files to generate a complete picture of what it includes.

Crawlers bring what they’ve learned on their journey back to the search engine.

Subsequently, they upload any new information about your site to the search engine’s master map,

which is then used to index and rank your content based on a variety of parameters.

Crawlers then do it all over again, and again, and again, and again.

With the internet’s ever-changing landscape of websites,

web crawlers must conduct each of these processes frequently to guarantee that they have the most up-to-date information possible. 

Most crawlers will scan your site every few seconds to ensure

that any improvements you make are quickly indexed, rated, and given to searchers in the SERP.

Consider what you can do to make it as simple

as possible for crawlers to fill up their maps when you construct or update your website.

Top 5 Crawlers for Search Engines


Every major search engine in the world has its web crawler. 

While they both perform the same functions, there are small distinctions in how they crawl your site. 

Understanding those distinctions can assist you in creating

a website that optimized for each search engine.



Google’s protocols are the industry standard for most crawler programs

because it is the most popular search engine on the planet. 

Their crawler, the namesake Googlebot, is composed of two different crawler programs,

one emulating a desktop user and the other simulating a mobile user,

which is dubbed Googlebot Desktop and Googlebot Smartphone, respectively. 

Both bots will crawl your site every several seconds or such.

One of the greatest things you can do to optimize your site for Googlebot, according to Neil Patel, is to keep things simple:

“Googlebot does not crawl JavaScript, frames, DHTML, Flash, and Ajax content as well as regular ol’ HTML.”

” Creating your site in this manner can also help to streamline the experience for your readers

properly structured HTML code renders considerably faster and more consistently than the other protocols.”

This implies your site will load faster,

which is a good indicator for Google when rating your site. 

When you optimize your site for crawlability, you increase its ranking potential. 

Keep this in mind when you learn about how other search engine crawlers evaluate your website. 

It is feasible to modify the structure of your website to directly appeal to each. 

Bingbot is up next.



It is the name of Bing’s primary web crawl (there’s a trend here with the names). 

They also have crawlers for advertisements and preview pages named AdIdxBot and BingPreview, respectively. 

Bing, unlike Google, does not have a specialized crawler for mobile sites.

While Bingbot adheres to many of the same guidelines as Google,

you do have some extra control over how and when Bing scans your site. 

Bing optimizes crawl times using proprietary algorithms,

but you may change them using their Crawl Control tool.

This feature assures that you will not have any difficulties

with site speed during periods of significant incoming traffic. 

In their Webmaster Guidelines,

Bing also gives a lot of detail on how they go about the process.

Learning these principles allows you to personalize your site to their crawler,

increasing traffic and providing a better experience for your users. 

Understanding how Bing employs their web crawler will also help you comprehend our upcoming search engine.



DuckDuckBot is the crawler software for DuckDuckGo, a privacy-conscious search engine. 

While DuckDuckGo leverages Bing’s API to surface relevant search results,

as well as around 400 more sources, its custom crawler still reviews your page.

Their crawler differs in that it prioritizes the most secure websites first. 

While you should utilize a secure SSL protocol for your website,

DuckDuckBot prioritizes security as the most essential ranking criteria for both security and SEO advantages.

Understanding how to make your website as safe as possible is the way to go if you want to rank in DuckDuckGo.

This includes removing any intrusive tracking JavaScript or data-mining ad services. 

However, if your target audience is security/privacy-conscious,

it might be advantageous.

Just bear in mind that pursuing search rankings on a certain platform might be difficult if you aren’t attentive. 

You don’t want to pigeonhole your site by narrowly targeting it.



Baiduspider is the Chinese search engine Baidu’s web crawler. 

While it’s best to use Baiduspider when targeting certain overseas audiences,

it’s also one of the most popular site crawlers on the internet. 

They also follow particular guidelines while reading a robots.txt file.

When you create a robots.txt file for the Baiduspider, you may index your site while also blocking the following functionality:

Using the page’s links

Keeping the results page in a cache

Examining images

This level of detail allows you more control than many of the other crawlers we’ve discussed thus far. 

Baidu also informs us that they employ a variety of different agents for crawling various types of material. 

This allows you to design even more tailored rules based on the bot you suspect is crawling your site.



Yandexbot is the Russian search engine Yandex’s crawler. 

They, like Baidubot, employ the same crawler for the whole internet,

with multiple agents for different categories of material. 

Furthermore, you may add special tags to your site to make it easier for Yandex to index.

Yandex is the most well-known of these tracking tags.


You may directly enhance the crawl speed for Yandex by using this tag. 

Connecting it to your Yandex Webmaster account takes it a step further, enhancing the performance even further.



A search engine crawler evaluates your site in much the same manner that a user would. 

If it’s tough to appropriately digest data, you’re setting yourself up for worse rankings. 

You may optimize your site for greater ranking potential from

the start if you understand the underlying technologies and protocols that these crawlers use.

Optimizing your page’s crawl ability is arguably one of the simplest technical adjustments

you can make to your website from an SEO standpoint. 

Any modifications you make will display in the SERP as soon as your sitemap and robots.txt files are in order.

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