This book will present information on sensors and the applications in which they can be used, as well as an introduction to Internet of Things (IoT) and cloud computing. The notion of tiny instruments and their use as sensors is presented to the readers. The following chapters provide an explanation of the architecture of the Internet of Things (IoT), in addition to offering remarks on the installation, demonstration, and other challenges associated with loT systems. The book delves further into the subject matter by discussing topics such as sensor-cloud infrastructure, mobile cloud, fog computing (an extension of cloud computing that brings cloud computing to the forefront of networking where data is created), and the integration of Internet of Things devices with cloud computing. In addition to that, it includes some remarks on the classification of fog-computing systems. This book has chapters that give ordinary readers and students of computer science with critical knowledge that will allow them to comprehend the fundamentals of cloud computing networks, as well as ideas and applications linked to cloud computing. The term “Internet of Things” (IOT) refers to both real and virtual things that have their own distinct identifiers and are linked to the internet. These objects are used to power “smarter” applications in a variety of industries, including energy, logistics, industrial control, retail, and agriculture. The Internet of Things (IoT) is a new revolution of the Internet that is fast gaining pace driven by the developments in sensor networks, mobile devices, wireless communications, networking, and cloud technologies.