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Over the last decade, data processing shifted from cloud computing to the local processing environment named Fog computing. Fog computing is an extension of cloud computing, which process data nearby device instead of sending to the cloud this will reduce the burden from the Internet and quick processing. In this paper, we describe fog computing technology, infrastructure, and applications. Specifically, we present the latest development of fog networking, quality of experience, cloud at the edge, platforms, security, and privacy. Finally, we discuss the current research, solutions and present open issues of future research in Fog computing.