MarkLogic Server is a document-oriented database developed by MarkLogic Corporation. It is a multi-model NoSQL database that has evolved from its XML database roots to also natively store JSON documents and RDF triples, the data model for semantics. MarkLogic is designed to be a data hub for operational and analytical data. 
MarkLogic Server was built to address shortcomings with existing search and data products.The product first focused on using XML document markup standard and XQuery as the query standard for accessing collections of documents up to hundreds of terabytes in size.
Current the database platform is widely used in publishing, government, finance and other sectors.  MarkLogic's customers are mostly Global 2000 companies.
MarkLogic uses documents without upfront schemas to maintaining a flexible data model. In addition to having a flexible data model, MarkLogic uses a distributed, scale-out architecture that can handle hundreds of billions of documents and hundreds of Terabytes of data. It has received Common Criteria certification, and has high availability and disaster recovery. MarkLogic is designed to run on-premises within public or private cloud environments like Amazon Web Services.
MarkLogic indexes the content and structure of documents including words, phrases, relationships, and values in over 200 languages with tokenization, collation, and stemming for core languages. Functionality includes ability to toggle range indexes, geospatial indexes, the triple index, and reverse indexes on or off based on your data, the kinds of queries that you will run, and your desired performance.
MarkLogic uses RDF triples to provide semantics for ease of storing meta data and querying.
Unlike other NoSQL databases, MarkLogic maintains ACID consistency for transactions.
MarkLogic provides high availability with replica sets.
MarkLogic scales horizontally using sharding.
MarkLogic can run over multiple servers, balancing the load or duplicating data to keep the system up and running in case of hardware failure.
MarkLogic has built in security features such as element-level permissions and redactions.
Optic API for Relational Operations
API that lets developers view their data as documents, graphs or rows. 
MarkLogic provides redaction, encryption, and element-level security(allowing for control on read and write rights on parts of a document). 
- Banking 
- Big Data
- Fraud prevention
- Insurance Claims Management and Underwriting
- Master data management
- Recommendation engines
MarkLogic is available under various licensing and delivery models, namely a free Developer or an Essential Enterprise license. Licenses are available from MarkLogic or directly from cloud marketplaces such as Amazon Web Services and Microsoft Azure.
- 2003—Cerisent XQE 1.0
- 2004—Cerisent XQE 2.0
- 2005—MarkLogic Server 3.0
- 2006—MarkLogic Server 3.1
- 2007—MarkLogic Server 3.2
- 2008—MarkLogic Server 4.0
- 2009—MarkLogic Server 4.1
- 2010—MarkLogic Server 4.2
- 2011—MarkLogic Server 5.0
- 2012—MarkLogic Server 6.0
- 2013—MarkLogic Server 7.0
- 2017—MarkLogic Server 9.0: Data integration across Relational and Non-Relational data.
- Document database
- Graph database
- Multi-model database
- Triple store
- Operational data store
- Online analytical processing
- "MarkLogic Adds Element-level Security to Its NoSQL Database". eWEEK. Retrieved 2018-03-21.
- "Key steps to keeping data information safe - SD Times". SD Times. 2018-02-21. Retrieved 2018-03-21.
- "MarkLogic 4.0 Introduces Stable of New Features for the XML Server". Information Today. 9 October 2008. Retrieved 27 January 2015.