This document provides an introduction to big data and analytics. It discusses definitions of key concepts like business intelligence, data analysis, and big data. It also provides a brief history of analytics, describing how technologies have evolved from early business intelligence systems to today's big data approaches. The document outlines some of the key components of Hadoop, including HDFS and MapReduce, and how it addresses issues like volume, variety and velocity of big data. It also discusses related technologies in the Hadoop ecosystem.