The focus of this special issue is on the Internet of Things (IoT) with a particular emphasis on the use of Cloud edge computing as a building block of the IoT architecture and a key infrastructural support for IoT applications. Cloud edge computing provides a number of benefits including enhanced network performances, lower operational costs, alleviated network congestion, and improved survivability. However, it raises new challenges in terms of device deployment, application monitoring,

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... ces management, etc. The objective of this special issue is to capture the latest advances in this research field and merging standards. Nine papers have been accepted for this special issue. Reviewers' comments were very helpful to select the most significant contributions as well as to improve the content, quality, and presentation of the accepted papers. These papers address some of the most challenging new problems. They provide an overview of and in-depth research, development, and deployment efforts on the Cloudification of IoT, specifically on the design of fog infrastructure for IoT, fog resource optimization for IoT applications, and security and privacy enhancements in cloud fog environments. Hereafter, a summary of each paper accepted in this special issue is described.