The main objective of this book is to illustrate the stages of development of the mobile and mobile applications in terms of establishment to the present day, and to describe the important factors in its development cycle. In addition to illustrating how the competition between the manufacturers of mobile and mobile application are, the book also gives briefly the important factors that companies should consider before developing reliable mobile devices and mobile applications. This book starts by the definition of the words mobile, mobile applications, and the most important areas in the development of mobile devices. The impacts of mobile devices in our everyday activities are described. The book provides information about the popular companies in the field of manufacturing mobile devices and developing mobile applications. The market share of each company and their popular devices are covered. Also, examples of the two most popular operating systems, the iOS and Android are given and the features of the two are compared, giving the advantages and disadvantages of each operating system. We hope that you get great enjoyment and satisfaction during your reading...