Recently, Big Data has become a significant concept in various areas, especially with business sectors. Digital devices, social media, and simulation results are producing a vast amount of data which are used by various applications to find insights. However, conceptual work integrating the Big Data applications into categories has been limited. The goal of this paper is to classify Big Data use cases by application's characteristics and to provide a systematic review of Big Data usages in each application classification which is based on examination of the available use cases and survey of related works. Big Data applications are classified into three categories such as industry and business, scientific research, urban planning. The critical aspects of the classified areas are described to determine the importance of Big Data in these areas. Fog computing and cloudlet are presented as the core technology of collecting data. Twitter, LinkedIn, Facebook, and Netflix are discussed as industry and business cases of Big Data.