Biofilms are bacterial communities encased by extracellular matrix produced by the residing bacteria. Cyanobacterial biofilms are environmentally prevalent, and additionally, often occur in an industrial context, imposing damage and leading to financial loss; however, information on cyanobacterial mechanisms involved in biofilm development is scarce. Thus, our studies provide a new cellular context in which to investigate the developmental process of biofilm formation. We recently uncovered a process of self-inhibition of biofilm formation in the cyanobacterium S. elongatus. Additionally, we identified genes essential for biofilm development (see “Our Projects” for details).