Giffard Ginger of the Indies liqueur is a selection from Giffard's premium liqueur line. It is a maceration (that is, an immersion or good ol' soaking) of Asian ginger along with other spices--including vanilla and orange blossom as softeners--for "a warm and rich character." It is a pale golden color and recommended served on the rocks.
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.