SCADA system stands as an abbreviation of Supervisory Control and Data Acquisition. It focuses on the supervisory level and is not a full control system. It is a computer system which gathers and analyses real-time data. They are useful in monitoring and controlling a plant or industrial equipment like telecommunications, water, waste control, energy, oil-gas refining, and transportation. It gathers information about a mishap, transfers it back to a central site and alerts the home station about the mishap, carries out necessary analysis and control, like determining if the mishap occurred is critical, and display the information in a logical and organized fashion. They can be relatively as simple as a system which monitors environmental conditions of a small office building, or as complex as a system that monitors all the activity in a nuclear power plant. IoT acts as a complementary setup to SCADA. SCADA system generates information which acts as one of the data sources for IoT. While the focus of SCADA on monitoring and control, the focus of IoT is firmly on analyzing machine data to improve productivity.