The difference between bolognese sauce and regular spaghetti sauce is that regular spaghetti sauce is any type of sauce that is served with spaghetti.
And bolognese sauce is made with ground or minced meat, like beef or pork as well as a mix of vegetables such as carrots, onions, celery, wine, which is often white wine and dairy such as cream or milk and has only a small amount of tomato in the ingredients.
Generic spaghetti sauce can be a simple tomato and garlic sauce also known as marinara, a creamy sauce, or a tomato based meat sauce which lacks the specific ingredients and slow cooked complexity of authentic Bolognese sauce.
Bolognese sauce, which is known in Italian as ragù alla bolognese or ragù bolognese, is the main variety of ragù in Italian cuisine.
Bolognese sauce is associated with the city of Bologna. Ragù alla bolognese is a slowly cooked meat-based sauce, and its preparation involves several techniques, including sweating, sautéing, and braising.
Spaghetti sauce can refer to many different sauces made primarily from tomatoes.
In some countries the term spaghetti sauce refers to a sauce to be served as part of a dish; in others, it is a condiment.
Spaghetti sauce is essentially a version of a marinara sauce.
Spaghetti sauce usually contains added ingredients such as ground beef to make a bolognese sauce.