Definition, How it Works and Its Functions [Terlengkap]

Search engines can indeed provide any information you want quickly. However, do you know what allows that to happen? It is a web crawler.

This web crawler is responsible for making search engines work properly and correctly. Its existence is not widely known by many people, but its function cannot be underestimated.

Therefore, in this article, we will discuss web crawlers in depth. Because, not only is he responsible for finding information, but he also has many benefits, you know. Listen to the end, OK!

What are Web Crawlers?

Illustration of Spiders Web Crawler

Definition of a web crawler–or often also called spiders— is a tool for indexing and downloading content from the internet, then stored in search engine databases.

So that when someone is looking for information, the search engine will immediately display relevant results from the database.

If you are still confused, try to imagine a librarian. This librarian is in charge of tidying up the books in the library so that visitors can easily find the books they are looking for.

These books are organized by category and topic of discussion. Thus, the librarian should look at the title and brief description of the book before placing it on the appropriate shelf.


crawlers collect / index any information that is useful on the internet. From article content, images, videos, sounds to email addresses and RSS feeds.

Web Crawler Example

Every search engine on the Internet has its own web crawler. Therefore, if you do a search with the same keyword in another search engine, it will produce different results.

Some other web crawlers besides Googlebot are as follows:

  • Bingbot from Bing
  • Slurp Bot from Yahoo
  • DuckDuckBot from DuckDuckGO
  • Baiduspider from Baidu (search engine from China)
  • Yandex Bot from Yandex (search engine from Russia)
  • Sogou Spider from Sogou (search engine from China)
  • Exabot from Exalead
  • Alexa Crawler from Amazon

Google as the leader of the search engine market share displays much better search results than other search engines. Therefore, you must prioritize getting your website indexed by Googlebot.

id="Bagaimana_Cara_Kerja_Crawler">How Do Crawlers Work?

The internet is always changing and evolving all the time. Because it is not possible to know the exact number of how many pages there are on the internet, this web crawler starts its work based on a list of page links that it already knows from the sitemap of a website.

Well, from the list of sitemap links, he will find other links scattered in it. After that, he will do crawling to those links just found. This process will be repeated in the next link and can continue to run without stopping.

However, this web crawler does not carelessly do crawl. There are some rules that they still have to obey, so they can be more selective in their crawl. Usually in doing crawlinghe considers three things:

How Important and Relevant is a Page

Web crawlers do not necessarily index everything on the internet. It determines which pages need crawl,

based on the number of other pages that link to that page and the number of visitors to it.

So, if a page appears on many other pages and gets a lot of visitors, chances are that the page is indeed important.

These important pages usually contain content or information that is needed by many people, so search engines will definitely include it in the index so that people can more easily access it.

Regular Visit

The content on the internet is always changing every second. Either because of an update, deleted, or moved to another place. Therefore, web crawlers need to visit various web pages regularly to ensure that the latest version of the page is indexed.

Moreover, if the page is an important page and many visitors, he will certainly make frequent repeat visits to it regularly.

Web crawlers also determine which pages need crawling based on robots.txt wishes. So before crawling to a website, it will check the robots.txt of that website first.

Robots.txt is a file on a website that contains information about which pages can be indexed and which pages cannot.

Web Crawler Functions

The main function of a web crawler is to index content on the internet. But besides that, there are several other functions that are equally important:

id="1_Membandingkan_Harga">1. Compare Prices

Web crawlers can compare the price of a product on the internet. So that the price or data of the product can be accurate. So, when you search for a product, the price of the product will appear immediately without the need to go to the seller’s website.

2. Data for Analysis Tools

Website analysis tools such as Google Search Console and Screaming Frog SEO rely on web crawlers to collect data and perform indexing. So that the data generated is always accurate and up-to-date.

3. Data For Statistics

Web crawlers also provide important data that can be used for news websites or statistics websites. For example, news search results that will appear on Google News. To appear on Google News, websites need a special sitemap that will be crawled by web crawlers later.

How Does a Web Crawler Affect SEO?

A web crawler is a tool that functions to perform crawling and indexing. Well, if IAR does not index your website, then your website will not appear in search results. If the website doesn’t even appear in the search results, it is impossible to get the top position in the search results.

So in other words, before you do any SEO tactics, make sure your website is indexed first. Therefore, make sure your website is indexed by following the complete guide that we have written in this article.

Blocking Web Crawlers

As mentioned above, you can block or prohibit web crawlers from doing this crawling using robots.txt.

Why is it blocked? Because, under certain conditions, there is content that does not need to be included in the index. An example is duplicate content. This duplicate content can actually get your website removed from the index. Therefore, it is better if this duplicate content is not indexed by web crawlers.

In addition, it prohibits web crawlers from doing crawling on pages that are not important can reduce the load on your website and speed up the process indexing.

For how to create robots.txt and how to implement it on your website, we have provided a guide in this article.


For a tool that works behind the scenes non-stop, this web crawler provides a lot of benefits, doesn’t it?

After knowing the many benefits, you definitely want a web crawler to index your website. Well, to make web crawlers index your website, then you need to optimize your website. Both from the SEO aspect, design, to the responsiveness of your website.

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