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Cell wall is a tough, rigid layer that surrounds some types of cells. Cell wall is a characteristic feature to cells of plants, bacteria, fungi, algae and some archaea. It is located outside the cell membrane. The major function of the cell wall is to provide rigidity, tensile strength, structural support, protection against mechanical stress and infection. It also aids in diffusion of gases in and out of the cell.
Thus, the cell wall can be several layers thick, each layer being a sheet of linked peptidoglycan units. The Gram-positive bacterial cell wall is distinguished by having multiple layers of peptidoglycan sheets and is thus up to ten times the thickness of a Gram-negative bacterial cell wall.