Microbial exopolysaccharides (EPS) obtained from microbial sources, became simply available for a broad range of applications, especially for medicine and pharmaceutical industries. One of these EPS bacterial cellulose known as biocellulose (BC). BC is a pure extracellular cellulose, which accumulate outside the cells, produced by several species of microorganisms, like Gluconacetobacter; Achromobacter; Sarcina and Agrobacterium with a great number of applications. It is an organic unbranched polysaccharide, type β-1,4-glucan, composed of glucopyranose residues. Biocellulose is used as artificial skin and occlusive dressings to treat chronic wounds and to heal burns, in microsurgeries as artificial blood vessels, scaffolds in tissue engineering and many other applications. This work represents a review on this remarkably microbial biomaterial and thus an update of a collection of scientific data from original research between 1979 and 2016. The paper started on structural, composition, properties and characterization and biogenesis of this biopolymer, then it gives a synthesis on a variety of biomedical applications.