Freebase: the largest semantic database in the world.

Freebase can be regarded 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 through information sources such as Wikipedia and MusicBrainz, plus manual upload and editing, and provides semantic technology (what is semantic technology) to better find data and information from it.