What is a search engine and how do they work?

An Internet search engine is a program that allows you to search the Internet and based on it’s algorithms collects, arranges and presents information.

Modern search engines can analyse data and combine it semantically with various websites. Hint (type?) in the query, correct errors, complete the query, combine it with local data (e.g. Google Maps), recognise the voice, read images and personalise the collected results for a specific person.


Components of search results:

  • Breadcrumb navigation;
  • Page title;
  • Description of the page in bold phrases that the user has entered into the search engine;
  • Rich snippets

Search results can vary even if we refresh the previous query on the same computer. This is obvious for paid ads (Google Ads). Paid ads rotate constantly because they are related directly to the funds allocated to them, and besides, most of the ads in search engines are paid on an auction basis, i.e. whoever gives more at a given moment will have a higher displayed ad.

However, in the case of natural results, the differences in the displayed results may be due to several factors.

  • One possible situation occurs when you connect to various Google Data Centres. After the initial connection, your query then connects to the nearest and least occupied GDC. It is then analysed on it analysed in it, and you receive the displayed results. However, there are so many queries and the popularity of search engines is so huge that one data centre would not be able to service all users. In addition, access to large amounts of data is limited by network bandwidth and location. Updating data in GDC does not take place simultaneously. This is why GDCs can present data differently. For example, if as a result of your SEO activities, the visibility of your website achieves high rates in response to specific phrases, then at the initial stage of sending data between GDC it may turn out that the positions differ significantly. Therefore, for one query the phrase is in the position e.g. third, and for the next one it disappears completely from the search results. In this case, please wait patiently for the data to stabilise.
  • Another situation is matching the results to a given person, known as personalised search results. If you do not clear cookies (cookies) or have a Gmail account and are logged in while using the browser, then your search results are certainly matched to your person based on your previous search history (among the top results there will be pages that you often visit) , location, and the device you use. Google determines your location, shows you local results, and matches the results to the device you are using because the device indexes are different.

Global queries become personalised after searching according to the local criteria and language that is used. In the circumstance that you are looking for an online English course, there is no need for a local match. In this case, your preferences (e.g. the language used in the browser) and the history of previous searches are taken into consideration.

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