Generative AI and intelligent systems transform technology, reshaping how humans interact with machines and how data-driven decisions are made. From chatbots that enhance customer engagement to advanced cybersecurity systems that detect digital threats, these innovations demonstrate the versatility of AI. By combining machine learning, natural language processing, and autonomous processes, generative AI enables systems to analyze information and create, adapt, and respond intelligently. As these technologies evolve, they also raise important questions about ethics, security, and the future of human–machine collaboration in a connected world. Generative AI Applications and Intelligent Systems: From Chatbots to Cybersecurity explores how generative AI and intelligent systems revolutionize fields like communication, automation, and cybersecurity. It examines the development, applications, and ethical implications of AI technologies that generate content, make decisions, and enhance digital security. This book covers topics such as computer engineering, security and privacy, and data science, and is a useful resource for engineers, security professionals, academicians, researchers, and scientists.