Freebase: the largest semantic database in the world.

Freebase can be considered as the largest semantic database in the world. It is a huge knowledge base jointly organized and maintained by computers and human beings. It collects, organizes, and归纳s knowledge and information, and provides semantic technologies (what are semantic technologies) through information sources like Wikipedia and MusicBrainz, along with manual uploads and edits, in order to better find data and materials from it.