Rebaudioside A is a natural sweetener derived from the leaves of the stevia plant, known scientifically as Stevia rebaudiana. It is part of a group of compounds called steviol glycosides, which are responsible for the plant's sweet taste. Rebaudioside A is often used as a sugar substitute because it is much sweeter than sugar but contains no calories. This sweetener is popular in various food and beverage products, as it provides a sweet flavor without the added calories associated with traditional sugars. Additionally, rebaudioside A is considered safe for consumption and has been approved for use by several health organizations, making it a common choice for those looking to reduce sugar intake.