Agave nectar is a natural sweetener made from the blue agave plant, the same plant used to make tequila. This natural sweetener is used in numerous cocktails as an alternative to sugar because of its remarkable taste, long shelf life and lower glycemic index. 
The nectar is made by cooking and filtering the sap from the pina, the heart of the blue agave plant. The taste of the blue agave nectar is comparable to the taste of honey but is less viscous, making it perfect to sweeten cold drinks because it dissolves quickly. Plus, being a natural sweetener, it does not have a bitter aftertaste the way artificial sweeteners often do.