The expansion of big data and the evolution of Internet of Things (IoT) technologies have played animportant role in the feasibility of smart city initiatives. Big data offer the potential for cities to obtainvaluable insights from a large amount of data collected through various sources, and the IoT allows theintegration of sensors, radio-frequency identification, and Bluetooth in the real-world environment usinghighly networked services. The combination of the IoT and big data is an unexplored research area that hasbrought new and interesting challenges for achieving the goal of future smart cities. These new challengesfocus primarily on problems related to business and technology that enable cities to actualize the vision,principles, and requirements of the applications of smart cities by realizing the main smart environmentcharacteristics. In this paper, we describe the state-of-the-art communication technologies and smart-based applications used within the context of smart cities. The visions of big data analytics to supportsmart cities are discussed by focusing on how big data can fundamentally change urban populationsat different levels. Moreover, a future business model of big data for smart cities is proposed, and thebusiness and technological research challenges are identified. This study can serve as a benchmark forresearchers and industries for the future progress and development of smart cities in the context of bigdata.