The Google search engine was born in 1996,

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when students Larry Page and Sergey Brin placed it on a subdomain of the Stanford University website — google.stanford.edu. A separate domain, google.com, was registered in the fall of 1997 and soon became one of the most popular websites in the world.

Since in most cases there are millions of pages matching a single keyword, Google uses certain ranking methods to select and rank the most relevant ones.

The algorithms of this search engine are based on the sequential execution of several interrelated processes: first, pages are studied and indexed, and then displayed in a certain order depending on relevance and personalization.

At the moment, Google search austria email list results show not only web pages, but also information from books stored in the largest libraries, and also allow you to find out the schedule of transport and much other useful information. The system owes its expansion of capabilities to a modern technology called the "Knowledge Network".

Scanning
Scanning

Web crawling, or web crawling, is the process of studying newly appeared sites and updating information about previously analyzed ones. This task is performed in Google by specially programmed bots. The basis of the crawl is the Sitemap file, in which all information about the site is saved for further use by search engines.

A Google bot, or crawler, is a program that finds and downloads web pages, compresses the data and sends it to a server. During processing, the crawler follows the links available to it, thus analyzing the content of the entire site. The top-level pages are scanned first, since the content posted on them is considered the most important. Then the bot studies the lower levels one by one.

You can interact with Googlebot by specifying what to crawl and what not to crawl. Usually, the prohibition on processing is written in the robots.txt file, but this does not always prevent the link from appearing in search engine results. The noindex attribute, which is added to the page code, or the noindex header, specified in the HTTP request, will help to guarantee that the link will not be publicly accessible.