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Each search engine has its own bot programs that check websites for relevance and quality of the content presented on them. At the same time, the standards of such robots are constantly being improved. It should be noted that developers do not fully disclose the essence of indexing algorithms, so specialists constantly analyze search programs and, based on available practical data, form certain conclusions.

The requirements that Google and Yandex impose on website indexing have much in common. Therefore, we can formulate some universal recommendations:
More attention should be paid to the quality of content (uniqueness, usefulness and literacy). Programming and spelling errors are clearly tracked by bots and reduce the site's authority index.
Internet platforms should have a clear structure. It is important that they are user-friendly and contain important and valuable information.
It is necessary to carefully develop contact and feedback pages, place a portfolio and reviews, and also describe existing achievements.
The site needs to have working outgoing links.
The content on Internet sites should be constantly updated, and their functionality should be improved taking into account various innovations and developments. All this is taken into account by search engines when ranking sites.
The Yandex search engine has two robots - the main one and the fast one (Orange). The first one indexes the entire Network, and the second one provides the ability to quickly search for the most recent and relevant information at the user's request. Each robot has a list of data that needs to be indexed.
According to experts, Yandex works slower than Google. However, the Runet search engine indexes useful materials and excludes “unnecessary” results from the search results.
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Google's advantage is its universality. Yandex is developing exclusively in the Russian-language Internet (attempts to enter other markets have taken place, but have not yet been successful).
The Yandex system is focused on searching for queries from a limited list of regions. But it is precisely the regional character that largely determines its success. Currently, Google and Yandex occupy approximately the same niches in the Russian-language Internet.
Yandex indicates sites that require regional binding:
Information resources that have a regional focus. In Yandex Webmaster, you must specify your preferred region.
Sites that offer the sale of goods or services. This category includes a wide range of sites, from online stores to dating portals.
The Yandex search engine has not gained popularity in the Internet space of other countries, since the most significant search factors there are the user's language and location. Google's search results are built on these criteria. The Yandex system does not index by language features. Despite the fact that this search engine determines the user's location, it does not take this factor into account when processing a request. It is not possible to classify Runet sites by region depending on the language of the request. Yandex can customize search results exclusively by territorial feature, which is the uniqueness of this system.
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Not long ago, Yandex launched a new tool – the Andromeda search. After that, the search engine offers certain places in cities, gives the opportunity to collect user collections, informs about events from the world of sports, marks the status of Internet resources with special icons depending on their reliability and popularity. How the new tool can influence indexing is not yet entirely clear.
An important innovation of 2018 is the replacement of the TIC (citation index) indicator with the IKS (site quality index). The new indicator must be taken into account when promoting a resource.