Digital era has revolutionized human society during the last century. In fact, the information digitization process has led to designing computers, phones, and different other machines offering a plethora of applications running on standalone computing machines. Came then, digitized Information transport that has introduced digital communication and networking, where machines were connected forming very large networks, offering applications remotely. These machines connected to these networks created the opportunity to deploy different services, either in voice communication, data transfer, or entertainment, such as as TV, and has led to this digital society; now totally dependent on that biggest network ever, the Internet; one of the major human inventions. In this network, most of the information traffic is created and generated by people through email, web, and, other user services. Now, after the information digitization, the transport and the communication, ubiquitous computing is emerging, relying on digitized information coming from the real-world environment or for the industrial field, allowing the building of more task automation around us to better interact with the real-world environment. Ubiquitous computing, pervasive computing, and ambient intelligence have appeared lately as some of the most challenging and ultimate goals of the digitization process, where automatic processes are expected to be all around us to build the so called smart world, where the real and virtual worlds are co-existing together, where not only people are communicating through the network, but also any connected object or thing involved in a certain process...