MongoDB (from “humongous”) is an open-source document database, and the leading NoSQL database. Written in C++.

MongoDB is great for modeling many of the entities that back most modern web-apps, either consumer or enterprise:

• Account and user profiles: can store arrays of addresses with ease
• CMS: the flexible schema of MongoDB is great for heterogeneous collections of content types
• Form data: MongoDB makes it easy to evolve structure of form data over time
• Blogs / user-generated content: can keep data with complex relationships together in one object
• Messaging: vary message meta-data easily per message or message type without needing to maintain separate collections or schemas
• System configuration: just a nice object graph of configuration values, which is very natural in MongoDB
• Log data of any kind: structured log data is the future
• Graphs: just objects and pointers – a perfect fit
• Location based data: MongoDB understands geo-spatial coordinates and natively supports geo-spatial indexing

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