MongoDB (from “humongous”) is a high-performance, open source, schema-free, non-relational, document-oriented database. Trading off a few traditional features of databases (notably joins and transactions) in order to achieve much better performance, MongoDB is fast, scalable, and designed for web development. Mongo is in use at SourceForge, Etsy, foursquare, GitHub, NYTimes, Justin.tv, Disqus, Business Insider, and more.
