Moonshine is a distilled alcoholic spirit produced without aging in barrels. Production often takes place in unlicensed stills. In order to avoid attracting attention of the authorities, the illegal moonshiner works at night. As with other alcoholic spirits, yeast ferments a sugar. The sugar source is generally a grain, such as corn, rye, malted barley or a combination. The bootlegger purifies the alcohol he produces by distillation.