Marinara sauce, or pasta sauce is a slow-simmered sauce that is often made with tomatoes, garlic, and herbs.
There is all sorts of confusion surrounding these terms, but spaghetti sauce, marinara sauce, and pizza sauce are usually all tomato based sauces. Marinara sauce, or pasta sauce is a slow-simmered sauce that is often made with tomatoes, garlic, and herbs.  In America, we often refer to marinara as a meatless, tomato-based sauce.