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MongoDB is a document-oriented NoSQL database suited for for storing large amounts of data. MongoDB uses collections and documents rather than the tables and rows seen in conventional relational databases. The fundamental unit of data in MongoDB is a pair of key-value pairs, which make up documents. Collections are the equivalent of relational database tables in that they store sets of documents and perform specific functions.
MongoDB supports various types of data, and it is one of the NoSQL nonrelational database technologies that emerged in the middle of the 2000s. Typically, this technology is employed by big data applications and other processing tasks involving data that doesn't fit well in a rigid relational model.
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