This document discusses the taxonomy and classification of cyanobacteria. It describes their general features and orders including Chroococcales, Pleurocapsales, Oscillatoriales, and Nostocales. It then discusses their non-filamentous and filamentous forms, as well as heterocystous and non-heterocystous filaments. The document concludes by covering reproduction in cyanobacteria including vegetative reproduction through binary fission or fragmentation, and asexual reproduction through endospores, exospores, akinetes, and heterocysts.