Pullulan is a natural, water-soluble polysaccharide polymer produced by the fermentation of Aureobasidium pullulans. It is non-toxic, tasteless, and biodegradable. Known for forming strong, oxygen-impermeable films, pullulan is widely used in the pharmaceutical, food, and cosmetic industries. Common applications include edible films, oral dissolvable strips, capsule shells, and coating agents. It is also valued for its ability to improve product stability and appearance without altering flavor.