Search engine algorithms are configured so that they index well and rank high the quality resources that provide meaningful answers to users' questions.
Sites that try to deceive the search engine using spamdexing techniques, or pose a threat to the user by making their computers virus-infected or downloading unwanted programs or files, etc., can't be considered quality sites. They are restricted in search results by special algorithms. These restrictions may affect the indexing and ranking of a site.
You can check the site security and find out whether any restrictions apply to it on the Security and violations page of Yandex.Webmaster.
- SEO texts
Texts created to influence the search engine. They usually contain a lot of keywords and are useless for the user.
- Deception of mobile internet users (paid subscriptions)
Mobile internet users get subscribed to paid content services of mobile operators, often without their knowledge.
- Useless content, inappropriate advertising, and spam
Yandex considers such sites as non-compliant with the basic quality standards.
- SEO links for promotions (Minusinsk)
Placing links on third-party resources, which affect the search engine in order to promote your site.
- Undesirable programs and dangerous files
Dangerous or unwanted files/programs are found on a site. A mark appears in the search results saying that “According to Yandex, the site may contain dangerous files”.
- Dangerous sites
The site is infected. A message appears in the search results saying that “This site can be dangerous”.
- Cryptocurrency mining
The site has a script designed for mining cryptocurrencies on user devices.
- SEO links on site pages
Placing SEO links on your site in order to influence the search algorithms.
Sites created to redirect users to another site.
- Keyword stuffing
A site contains lists of search queries or texts full of keywords.
- Hidden text
The site contains invisible or poorly visible text created to deceive the search engine.
Fraudulent method that is used to collect the site users' personal data without their knowledge.
- User behavior simulator
Using special software or services that imitate user click-throughs from search engines.
- Assistance in user behavior simulation
Forcing regular internet users to click through to the site from the search results.
- Affiliate program
A site offers products and services from other sites as part of partner programs, and does not have any original content of its own.
Copying the content of popular sites, such as a bank or mobile operator's site, to steal the user's personal data.
- SMS fraud
A site uses methods that allow debiting money from the user's mobile account, often without their consent. A message appears in the search results saying that “Your site might be related to SMS fraud”.
To deceive the search engine, site users are shown the content that differs from that shown to the search robots.