This document provides an overview and examples of MapReduce (M/R), Pig, and Hive. It introduces M/R concepts like mapping, reducing, and joins. It demonstrates a simple word count M/R job. Pig and Hive allow writing M/R jobs using a higher-level language - Pig Latin and HiveQL respectively. Examples show averaging stock prices using Pig and joining datasets in Hive. M/R, Pig, and Hive scripts run as Hadoop jobs on HDFS data.