The new version of Sitecore has significantly less databases than in previous versions. Previous versions had 7 now there are only 3. The Core, Master and Web Databases are the only databases in the latest version of Sitecore.
Master stores all versions of content
Core stores all Sitecore settings for editors
Web store published version of content
The “Sitecore” and “Extranet” security databases were removed as they are now handled by the .NET security model and stored in standard tables.
The “Archive” and “Recycle bin” databases were removed as each database now has its own internal archive and recycle bin storage areas. The archive and recycle bin have also been enhanced to contain a search facility similar to the content editor.