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Biofilm formation is a development in which microbial cells accumulate to form enclaves that are embedded in a self-produced extracellular matrix. The knowledge of the cellular process involved in the sulfate-reducing bacteria (SRB) biofilm formation will facilitate the readers to discover and identify an efficient control mechanism to control biofilms on the surfaces of metals and biomedical devices. For example, understanding the mechanisms of SRB biofilm formation will help us control the industrial corrosions. In this chapter, we define the molecular features of the SRB biofilm matrix and the regulatory pathways as well as external factors that regulate its production. This chapter will advance imminent investigations of the underlying mechanisms that connect between biofilm formation with corrosions, as well as the cross-regulation between multiple signaling systems.