A plastic like film, but made from regenerated cellulose derived from wood. Cellophane it self is bio-degradable and does not have any barrier properties. The material is therefor often coated with plastic, nitrocellulose or similar materials with barrier properties. Most cellophane is therefor not bio-degradable or recyclable.
Many of the products claimed to be cellophane on the market today is actually PP, which have similar look and feel. PP expand when being curled or crushed, cellophane don't.