ArangoDB is a native multi-model database system developed by triAGENS GmbH. The database system supports three important data models (key/value, documents, graphs) with one database core and a unified query language AQL (ArangoDB Query Language). The query language is declarative and allows the combination of different data access patterns in a single query. ArangoDB is a NoSQL database system but AQL is similar in many ways to SQL.
3.3.14 / August 16, 2018
|Type||Graph database, Document-oriented database, Key/Value database, Multi-model database|
|License||Apache License 2.0|
ArangoDB has been referred to as a universal database  but its creators refer to it as a "native multi-model" database to indicate that it was designed specifically to allow key/value, document, and graph data to be stored together and queried with a common language.
ArangoDB provides scalable queries when working with graph data.[page needed] The database uses JSON as a default storage format, but internally it uses ArangoDB's VelocyPack – a fast and compact binary format for serialization and storage. ArangoDB can natively store a nested JSON object as a data entry inside a collection. Therefore, there is no need to disassemble the resulting JSON objects. Thus, the stored data would simply inherit the tree structure of the XML data. 
ArangoDB works in a distributed cluster unlike some other existing graph databases and it is the first DBMS being certified for the Datacenter Operating System (DC/OS). DC/OS allows the user to deploy ArangoDB on most existing ecosystems: Amazon Web Services (AWS), Google Compute Engine and Microsoft Azure. Moreover, it provides single-click deployment for the user's cluster.
Started in 2011, the database was originally released under the name AvocadoDB, but changed to ArangoDB in 2012.
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Multimodel databases (..., ArangoDB and more)
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...and several databases use JSON as their primary storage format – in particular, several open source document databases like ArangoDB,...
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