From the website:
Couchbase Server is powered by Apache CouchDB, the industry’s most advanced and widely deployed document database technology. It boasts many advanced NoSQL capabilities, such as the ability to execute complex queries, to maintain indices and to store data with ACID transaction semantics. Plus it incorporates geospatial indexing so developers can easily create location-aware applications. Couchbase Server provides an exceptionally flexible data management platform, offering the rich data management operations that developers expect from their database.
Couchbase Server is simple.
- Flexible Views and Querying. Built-in javascript-based map/reduce indexing engine is a powerful way to analyze and query your data.
- Schemaless Data Repository. Couchbase document model is a perfect fit for web applications, providing significant data flexibility.
- Geo-spatial Indexing. Built-in GeoCouch lets developers easily create location-aware apps.
Couchbase Server is fast.
- Durable Speed Without Compromising Safety. You get safety and speed with our architecture, no compromises.
- Indexing. Rapidly retrieve data in any format you demand, across clusters.
Couchbase Server is elastic.
- Peer-to-Peer Replication. Unmatched peer-based replication capabilities, each replica allowing full queries, updates and additions..
- Mobile Synchronization. Couchbase is ported to popular mobile devices and because it doesn’t depend on a constant Internet connection, users can access their data anytime, anywhere.