how search engine works

How Search Engines Works



Now, let’s look at how search engines work. The first thing to understand about search engines is that when you perform a search, the results that you see are not live results. They are results from the search engines database of websites. That’s right.  What this means is that as an optimizer, you need to ensure that the search engine is first able to find your website. Then download it, assess it properly, and then appear accurately in the search results.

In order for search engines and SEOs to work together. SEOs need to have an understanding of how this process of search engine indexing works.

So what we’re going to do here is we’re going to simplify it into four categories

  1. crawling
  2. storing
  3. processing
  4. indexing and ranking.


At the root of every search engine is Software. In this phase, we’re just going to talk about one type of software it’s something we call crawlers are bots, or robots, or spiders. Now, this is software that does one thing but it does that thing very very well. The crawler, or bot goes to a specific website and downloads all of its contents. back onto the servers of a search engine. It then follows every single link on that document, it goes to that corresponding page and downloads all of that content and then repeats the process by following all of those links and going to those pages and downloading that content. In theory, by doing this it crawls the entire Internet.

Crawlers or Spiders

Now sit back and think about how big the internet is and how quickly it’s growing. It actually has a whole lot of traps that it has to avoid. One of these traps is called an infinite loop. What will happen is a crawler goes on to something like a calendar application online and it goes to the next year. Then it’ll click on the link for the next year. And then it’ll click on the link for the next year and on and on. And it gets stuck.

Role of Crawlers in SEO 

It’s important for us to understand and make sure that the crawlers do not go to protected files, like something that should be password protected. For example, if you have user information stored on your website, then you want that protected and not open to the search engines. So luckily for us, most of the time when search engines come to our websites, they’ll identify themselves.


Now sitemap a sitemap is a representational model of a website’s content structure. There are two types of sitemaps. One is for primary users and the other is for search engines. Now for users, it lists the major hierarchy of the website and important pages and is designed for easy visual navigation. Now the second sitemap for search engines is an XML sitemap. XML is the language used, and it is mainly for search engines not so much for people. It lists all of the pages of the website in a single document, providing a map for search engine spiders to find every page.

Now you can generate the XML sitemap through WordPress, so through many different plugins, it’s essentially a long list of links for every page formatted for search engines, and it includes information about the images files and the date that the page was last updated.Well, it makes the job easier for search engines.


The next phase is what we call storing.Now these servers are located all over the world. The general idea here is that it’s stored on the servers and they’ve made a copy of your website. You can access this copy, it’s called the cache. It is important thing for SEO is to understand that search engines are not working on your live site.

They’re only working on the copy that they have on their own server. If you have problems with search engines not downloading your content properly, viewing the cache will help you see what the search engine sees. And this is going to have small differences like personalization. They’re going to crawl from different set locations.


The third phase and this is by far the most complex, it’s the processing and indexing phase. This happens in many different phases itself, and it happens in the many different data centres around the world. Quite frankly, this is where all the magic happens. This is where the billion-dollar algorithms go in and try to extract relevancy signals that can be used to figure out the most relevant and trustworthy information on the internet. The important thing to understand at this point is that this is a process that is mostly hidden to marketers and the general public.

page relevance and Trustworthiness

Now in order for the search engine to determine relevance and trustworthiness, the pages stored in the index are subject to numerous analyses. Hundreds of factors are analyzed. The major factors that are analyzed for each page and website are links to other documents and links from other documents, the content on the page and the website, the structure of the content, the structure of the programming, the date, that page was last updated, and other trust factors.


The last phase is the one you’re most familiar with. And that’s the rankings. So at this point, a user has typed something into a search engine. They’re getting the results back and the search engine needs to rank all the possible results they could have on the internet to something that is most relevant for the given phrase that was typed in. Now this is a very complex thing that happens incredibly fast. So when this happens, the query gets sent to the search engine servers. The information is already indexed and the ranking algorithms have taken effect with additional signals. This happens incredibly fast.




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