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In MapReduce, the map function processes input data in key-value pairs and outputs intermediate key-value pairs.

An optional function in the MapReduce framework used to combine intermediate key-value pairs with the same key to reduce the amount of data transferred between the map and reduce phases.

A fundamental data structure in MapReduce, consisting of a unique identifier (key) and associated information (value) that is processed by the map and reduce functions.

The reduce function in MapReduce takes the intermediate key-values pairs from the map phase, sorts them, and processes them to output the final result.

An open-source framework that allows for the distributed processing of large data sets across clusters of computers using the MapReduce programming model.