Couchbase Server, similar to MongoDB and RethinkDB, is a document-oriented distributed database, but that description sells it a good deal short. Couchbase is what you get when a distributed key-value store and a document database join forces -- literally.
With direct and immediate ties to both Membase and CouchDB, Couchbase Server takes the best of both worlds and jams them into a single product. It's even added structured queries to the mix. With the recent release of version 4.0, the open source database takes a big leap forward in usability with the introduction of the SQL-like N1QL query language.
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