Kielbasa is a type of Polish sausage that's usually made from pork and a blend of spices. It's often smoked or cured to give it that nice, savory flavor. But, here's the thing: just because it's been smoked or cured, doesn't mean it's automatically safe to eat raw.
In fact, uncooked kielbasa can contain trichinella, a type of parasite that can cause trichinosis. It's like that one friend who always seems to bring the party, but also brings a bunch of uninvited guests (aka bacteria and parasites). Not fun.