Today, Hadoop has been synonymous with big data as it has been the platform of choice for big data processing.Apache™ Hadoop® is an open source project governed by the Apache Software Foundation (ASF) that allows you to gain insight from massive amounts of structured and unstructured data quickly and without significant investment.
Hadoop started as an open source initiative (and still it is!) and soon it was adopted and nurtured by Yahoo! to support its web applications. Then many came forward to embrace it. According to Wikipedia, as of 2013, Hadoop adoption is widespread. For example, more than half of the Fortune 50 uses Hadoop.