Steviol glycosides are natural sweeteners derived from the leaves of the stevia plant, specifically Stevia rebaudiana. They are known for being much sweeter than sugar, with little to no calories, making them popular in food and beverage products as a sugar substitute. These compounds are extracted from the plant and include various types, such as rebaudioside A and stevioside. Steviol glycosides are considered safe for consumption and are often used in products labeled as "sugar-free" or "low-calorie," appealing to those looking to reduce sugar intake or manage weight.