It’s a traditional American soda that many Europeans hate. I’ve heard that it tastes like herbal toothpaste to them, but in America the only herb in our toothpaste is mint (though cinnamon is increasingly popular despite being a spice). But anyways yeah it’s a soda flavored like certain medicinal roots.
It is soda traditionally made with sassafras bark. I doubt they still use that to make it but in my (probably unpopular) opinion, it tastes like garbage.