Using many practical examples and notes, the book offers an easy-to-understand introduction to technical and organizational data security. It provides an insight into the technical knowledge that is mandatory for data protection officers. Data security is an inseparable part of data protection, which is becoming more and more important in our society. It can only be implemented effectively if there is an understanding of technical interrelationships and threats. Data security covers much more information than just personal data. It secures all data and thus the continued existence of companies and organizations.