Search algorithms are complex mathematical models that are assigned to pages by taking into account and evaluating a series of factors websites a certain rating on which their position in search results.

Search engine algorithms allow you to form the most relevant search queries extradition.

They are constantly being improved and replaced by more effective ones. Typically, new algorithms are a response search engines on the appearance of previously unknown illegal methods website promotion, with which they always try to fight.

Search engine algorithms also include filters, that do not just affect ranking sites, but purposefully seek non-compliance with certain conditions (non-unique content, spamfulness keywords, purchased external links poor quality) and underestimate their position or completely excluded from index.

Most problems webmasters deliver Panda and Penguin from Google, as well Minusinsk and AGC from Yandex.