Sugar crystals are solid forms of sugar that occur when sugar molecules bond together in a structured pattern. They are commonly found in various types of sugar, such as granulated sugar, brown sugar, and powdered sugar. The size and shape of sugar crystals can vary, with larger crystals often used for decoration or in recipes that require a crunchy texture. The process of forming sugar crystals is called crystallization, which occurs when a sugar solution is cooled or concentrated. This method is used in making rock candy, where sugar is dissolved in water and then allowed to crystallize on a string or stick. Sugar crystals are not only important in cooking and baking but also play a role in the food industry for sweetening and preserving.