Book excerpt: Expanding Horizon of Cyanobacterial Biology discusses the different aspects of cyanobacteria cyanobacterial application, providing a better understanding of cyanobacterial metabolism. Chapters deal with cyanobacteria applications and explore how to exploit cyanobacterial metabolism for industrial applications. Sections cover cyanobacterial applications for the production of nanoparticles, cyanobacterial diversity, and the characterization of different assemblages such as cyanolichens and cyanobacterial endophytes, along with their ecological, morphological and physiological aspects. In addition, bioactive compounds and their applications are explored. Increasing attention has been paid by scientists across the globe to Cyanobacteria as they are ubiquitous microbes and, undoubtedly, an important organism in terms of carbon as well as nitrogen fixation. However, the research on these organisms is limited in terms of their diversity and distribution across the globe. - Provides background knowledge for researchers concerned with cyanobacterial diversity and characterization of different assemblages - Describes the exploitation possibility of cyanobacterial species for human welfare - Discusses the different aspects of cyanobacteria, cyanobacterial application and better understanding of cyanobacterial metabolism - Deals with the exploitation of cyanobacteria and their mats for bioremediation purposes - Includes cyanobacterial nanotechnology and its applications in industry and allied sectors