Kielbasa, Kovbasa, Kolbasa, and Kubasa are common North American and Canadian anglicizations for a type of Eastern European sausage. Synonyms include Polish sausage, Ukrainian sausage, etc. In English, these words refer to a particular genre of sausage, common to all Eastern European countries but with substantial regional variations. In the Slavic languages, these are the generic words for all types of sausage, local or foreign.
In the U.S., "kielbasa" almost always means some form of wiejska (although often not U-shaped and seldom containing veal), which may be unsmoked ("fresh") or fully or partly smoked. There is also a brand of sausage pronounced the same but spelled Kiolbassa Sausage.