Abstract: Big Data and IoT (Internet of Things) are the emerging technologies in today’s computer world. Big Data is nothing but a huge amount of data that can’t be analysed and processed easily. Whereas the Internet of Things (IoT) is nothing but a system of interrelated computing devices which can be either mechanical or digital machines that provide the ability to transfer data over a network without requiring human-to-human or human-to-computer interaction. These two terms are being used by everyone without knowing their difference. This study will help you in comparing Big Data and IoT starting from their definition to applications.