The main goal of this book is to help readers understand the basic concepts and proceed to the immediate application of processes that cover the entire spectrum of Computer Science, without the need for prerequisite knowledge. At the same time, readers will form a sufficient understanding of the benefits as well as the consequences of misuse of Computer Science and its applications, with an emphasis on the Internet. A direct consequence of the above goal is the acquisition of self-confidence that will allow readers, not only to refer but also to express opinions on issues related to the modern world of Computer Science.