This is a loaded question - the true difference between a ragu and bolognaise is a hotly contested one, but there are differences.  Generally an Italian ragu is simply a meat-based sauce, so a bolognaise is a type of ragu. In bolognaise, the meat tends to be chopped very finely and there’s a lot more tomato in it. In some regions, bolognaise is made with white wine rather than red, but that’s not universal either.