With simple and understandable language, the book is not limited to technical knowledge, but exposes the reader to realistic situations concerning the management of dilemmas and the formulation of arguments about non-technical issues of computer science. In the 2nd Greek edition (14th American), among others, the following are included: Four new chapters on software programming, databases and information systems, networking and security in the business world, as well as the functioning of the internet. Additionally, reorganization and updating of the content, with extensive coverage of ethical issues in computer science. Furthermore, new diagrams, which visually represent important data, and a new design that provides a more open and linear flow, thus improving understanding.