Apache Pig is a platform for analyzing large data sets that consists of a high-level language for expressing data analysis programs, coupled with infrastructure for evaluating these programs. The salient property of Pig programs is that their structure is amenable to substantial parallelization, which in turns enables them to handle very large data sets. As an abstraction over MapReduce. It is a tool/platform which is used to analyze large sets of data representing them as data flows. All values associated with a single key are processed by the same Reducer.