Regular rice flour is a fine, powdery flour made from regular white rice. It's used mainly for baked goods. Glutinous or sweet rice flour (such as the Japanese mochi) is made from high-starch short-grain rice. It's widely used in Asian cooking to thicken sauces and for some desserts.
From The Food Lover's Companion, Fourth edition by Sharon Tyler Herbst and Ron Herbst. Copyright © 2007, 2001, 1995, 1990 by Barron's Educational Series, Inc.