Hadoop is simply a free and open-source software framework written in Java that stores and processes data on commodity hardware clusters. It has a lot of storage for any kind of data, a lot of processing power, and it can handle almost unlimited concurrent processes and tasks.Doug Cutting and Mike Cafarella founded Hadoop in 2005. It was created to aid with the spread of the Nutch search engine project. As the most demanded platform by the IT companies, it offers a wide range of learning opportunities and several opportunities to work in this industry. By simply adding extra computers to a Hadoop cluster, businesses may store as much data as they want, in any format.