Origami paper is the stuff that one folds origami
out of. While it is true that you can fold origami out of nearly any kind of paper, they make special paper
for purpose in Japan
There are different kinds of origami paper. There is the stuff you see in art supply stores, that's very thin and usually got different colors on one side. There's also metallic papers, which are also very thin. Finally there are heavy, printed papers, which are quite beautiful and have stylized patterns. These are a joy to work with.
There's a kind of joy also in folding origami out of scraps of paper you find lying around or from candy bar wrappers or other strange materials. Or is that just the look on bystanders' faces?