(1) Cloudera is a company that provides support and services for Apache Hadoop, the open-source distributed processing framework.
(2) Hadoop allows for flexible, scalable, and low-cost storage and analysis of large datasets across clusters of commodity hardware.
(3) Cloudera's enterprise offering includes its own distribution of Hadoop called Cloudera Distribution including Apache Hadoop (CDH), management tools, support, training and professional services to help organizations use Hadoop.