In an era where battles are fought not only with code but also with culture, this book explores the evolving landscape of cyber conflict through the lens of psychology, cognition, and information warfare. It delves into the hidden war waged across digital platforms: a war for attention, belief, and behavioural control. Drawing on research from psychology, the book examines how online spaces have become fertile ground for memetic warfare, disinformation campaigns, and cognitive manipulation. It investigates the psychological mechanisms that make individuals susceptible to digital influence, including cognitive dissonance, confirmation bias, and personality traits that shape vulnerability. From the motivations of hackers and propagandists to the architecture of viral misinformation, the strategic use of digital tools to exploit human cognition is unpacked. It also explores the role of personality psychology in understanding who is most at risk — and why — in the age of digital persuasion. Whether you're a researcher, policymaker, professional, or simply a curious reader, this book offers a compelling and timely analysis of the new terrain of cyber conflict, where minds are the battlefield and memes are the weapons.