Along with providing an overview of cloud computing, this book talks about the various other dimensions involved in it such as the risk issues and security challenges in cloud computing. It highlights the appplication safety and service vulnerability in cloud network. It also gives an introduction to IoT security and its open challenges, IoT architecture security and the introduction into the social network and its security issues, as well as the cyberspace security in the digital age. Currently, the world is facing rapid technological advancement in every field. Unarguably, the most affected area is digital technology. The use of digital devices has increased to a much greater extent in the last decade. In this book three major aspects of digital technology data, social media, cloud computing, and Internet of Things (IoT) are discussed. This book thoroughly examines the issues and vulnerabilities of IoT services. Due to the low cost of cloud services, almost every organization is storing their data in the cloud. This causes a big chunk of users’ personal data to be saved in the cloud, which can be a target for hackers who are always trying to get access to cloud storage. This book thoroughly examines the issues and vulnerabilities of IoT services.