Big data is used in the IT industry for IT staffing and resourcing, IT service level and problem management, IT governance and risk management, and IT network monitoring. Big data analytics is used for a lot of applications in the IT industry because of lot of data will be generated by companies. Without Big data, it is difficult to handle that huge data by traditional techniques.
If you want to learn big data, I recommend signing up this Big Data Certification program by Intellipaat that offers hands-on experience on real time projects and cases studies.