The difference is in the taste and texture. A balsamic glaze is essentially balsamic vinegar that has been sweetened and reduced to be thicker. Balsamic vinegar has a liquid consistency the same as other vinegar, while a balsamic glaze has a thick, syrup-like texture due to the reduction process. Also, a balsamic glaze retains the sweet-tart taste of balsamic vinegar, but the added sweeteners give it a much sweeter and more syrupy taste.