Google Issues Warning to Spam Sites
Sandbox is a new filtering and penalization update from Google. The purpose of Google's Sandbox is to prevent newly launched sites with no content or spam content from ranking high in search results by exchanging reciprocal links with other spam or normal sites using different keywords.
Many newly launched sites whose sole purpose is to earn money from advertisements (e.g., AdSense), with no content, copied content, or spam content, are penalized by Google's new sandbox update, either by being removed from search results or demoted to lower rankings. Older, established sites are not affected by the sandbox filter. However, if they produce spam or copied content for a long period, they will also be affected by this filter.Sandbox and Blackhat Working Systems
Keywords play a leading role in the application of the sandbox system or update. Sites related to the identified keywords enter the sandbox filter; sites that do not use these keywords are not included in this filter. Black hat, meaning 'black hat' in Turkish, refers to all efforts made to rank sites higher using optimization techniques outside of those determined by search engines.
Search engines strongly dislike these black hat SEO practices. As soon as a search engine detects that a site is using black hat SEO, it either completely bans the site or includes it in the sandbox filter, thus lowering its ranking. Therefore, SEO (search engine optimization) work should be carried out based on the criteria set by search engines, without resorting to such negative practices. 
