This classic book provides an overview to the field of computing, with new material on networking, C#, XML, and Java, making it the most current book available. The seventh edition has been thoroughly updated to discuss important trends in such areas as networking and the Internet, software engineering, public-key encryption, and artificial intelligence. The discussions of the ethical and legal issues revolving around computing have been expanded in this edition. This book is for those who are interested in taking a tour of the field of computer science, as well as those taking an introductory course on these topics.