The book "Cognitive Computing for Big Data Systems Over IoT" offers a comprehensive analysis of current trends and challenges in the field of cognitive data processing in connection with big data and the Internet of Things (IoT). It highlights the integration of expertise, data-driven thinking, and cognitive methods to expand existing approaches to data science. By incorporating insights from artificial intelligence, it enables a deeper understanding of the processing and analysis of large data sets. The work provides not only theoretical foundations but also practical applications aimed at addressing future challenges. It is intended for scientists, professionals, researchers, and academics who are engaged with the latest developments in cognitive data processing and the associated approaches to data science.