Creme Fraise des Bois is a a "wild strawberry" liqueur, presenting in a scarlet red. It is part of the Giffard Creme de Fruit liqueur line, featuring sweetened and intense flavors representing the various fruits.
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.