The name of the substitution process (from the English “swap” - “replace, exchange”) of the contents of web pages, after they take leadership positions in extradition.

Refers to illegal "black" SEO methods, because it leads to clogging search results pages, irrelevant user requests. After all, instead content, optimized for request the user by whom the page was originally raised up the issue will display completely different information designed to provide benefits to the website owner (advertising, commercial offers, links to other sites in need of reference promotion, etc.).

A characteristic feature vopping is the short duration of the sites that resorted to its use in the issuance of search engines - the fact of replacing content is recorded search robots during the next visit for the purpose reindexing and the “guilty” web resource goes into eternal ban - permanently excluded from index.