The term “NoSQL” is a broad descriptor covering a wide range of new databases, generally broken down into four main categories: document, key-value, column-family, and graph databases. Among these categories, document databases are the best general purpose databases. Document databases have a more logical, human approach to modeling data, are generally the most flexible and easy to use, and are the most popular. Among document databases, MarkLogic differentiates itself as an “Enterprise NoSQL” database because in addition to qualifying as a NoSQL database, it has all of the critical features that enterprises need to run mission-critical applications. This means ACID transactions, high availability, disaster recovery, government grade security, elasticity and scalability, and performance monitoring tools.