The speed of change in the world of cybersecurity is amazing. If you attend any meeting where cybersecurity is discussed, it can be like listening to a foreign language: blue team, black hat, metamorphic malware, steganography What are these people talking about? This dictionary began life as the reference section at the back of 'Cybersecurity for Beginners' and has now taken on a life of its own, with hundreds of the primary cybersecurity terms defined. This book is designed to be a useful companion for anyone who wants to keep up on cybersecurity terms or confound others with their understanding. Finally, cybersecurity does not need to sound like a different language. A clear and concise dictionary of cybersecurity terminology suitable for both the expert and layman.