Book excerpt: This comprehensive volume is a review on the pivotal role of seaweeds in the blue bioeconomy. It begins by introducing the blue bioeconomy concept which encompasses the use of renewable biological marine resources to produce food, materials and energy. The book then continues to explore the applications of seaweeds. Chapters cover the biomedical applications (nutraceuticals), functional applications (functional ingredients, biofertilizers), and commercial applications (cosmeceuticals, animal feeds) of seaweeds. Each chapter is structured into sections to provide an easy to understand summary of respective topics, with detailed discussions that reveal the intricate nature of seaweeds. The book shares perspectives from experts in environmental science and biology, with references for advanced readers. The book is for anyone who wants to understand the role of seaweeds in the bioeconomy and for sustainable development.