Artificial decline web resource positions in searchable output, which is used by the search engine in case of attempts to dishonestly optimize them in order to manipulate the ranking of the results of this very issue.
Usually used for sites that are promote by methods black SEO, in particular building reference profile using automatic promotion exchanges.
Can be done as in manual mode assors search engines, and in automatic as a result of operation filters.
Pessimization can be performed by applying a downgrade coefficient or by a accounting ban external links, which leads to a natural decrease in indicators authority "Prosecuted" site.
A sign of pessimization is a sharp and significant loss of website positions immediately on many key requests.