MarkLogic is a NoSQL database management system that is used to store, search, and manage large volumes of structured and unstructured data. It is a multi-model database, meaning it can support multiple data models such as documents, graphs, and key-value pairs.

MarkLogic is known for its ability to store and manage large amounts of data quickly and efficiently, and for its support for complex search and query operations. It also has built-in support for data integration and data governance, which makes it well-suited for use in enterprise applications.

MarkLogic is designed to be scalable and highly available, and it can run on a variety of platforms including Linux, Windows, and MacOS. It is available in both a commercial and an open-source version, and it supports a number of programming languages including Java, JavaScript, and Python.