Brown sugar is a type of sugar that includes molasses, giving it a distinctive flavor and color. There are two main types: light brown sugar and dark brown sugar. The primary difference between them is the amount of molasses; dark brown sugar has more molasses, resulting in a stronger flavor and darker color.

Brown sugar is often used in baking, where it adds moisture and a rich, caramel-like flavor to cookies, cakes, and other desserts. It can also be used in savory dishes, marinades, and sauces. Because of its molasses content, brown sugar tends to clump and harden more easily than white sugar, but it can be softened by placing it in a container with a slice of bread or a damp paper towel.