Permeability is the property of cellular membranes to allow selectively the diffusion of certain nutrients, ions, molecules or information through them. Typically, there are no permeable membranes in nature but are either selectively permeable or semi permeable which allow the exchange of ions or molecules through them with other molecules or with nature itself. They are present in both plants and animals. Depending on the membrane and the solute itself the permeability of a cellular membrane depends on various factors like the nature of the membrane, cell's operations and the nature of the solute, etc.
