Giffard Vanille de Madagascar premium liqueur is one of Giffard's premium liqueur lines. As the label suggests, it's made with vanilla from Madagascar, long recognized for premium vanilla. They describe the flavor as sweet an strong with hints of pine and eucalyptus.
Giffard is a French company specializing in a wide variety of liqueurs and eua-de-vie among other products. Some of those extra products are flavored cocktail syrups (or "sirop"). They are generally sweetened with pure cane sugar.