This document provides an introduction to big data and Hadoop. It discusses the three V's of big data: volume, variety, and velocity. Examples are given of the large amounts of data generated daily from various sources. The growth and market opportunity for big data technologies is also discussed. Common use cases for big data in different industries are outlined. The document then covers Hadoop components and how Hadoop HDFS and MapReduce work. Other Hadoop technologies like Hive, Pig, and Zookeeper are introduced. Benefits of Hadoop and commercial Hadoop distributions are summarized. Finally, technologies alternative to Hadoop like HPCC and SAP HANA are briefly described.