To distinguish between the two of them you have to know that both words are phonetic translations of the English language.

Salad is a dish whose dressing is divided into, Thousand Island dressing, vinaigrette, etc....... The thicker ones are made with salad oil and egg whipped and then blended, and the vinaigrette is of course olive oil lemon and other things blended.

Salsa is a concoction, or sauce,

such as tomato salsa, black pepper beef salsa ......

Looking at what you said, "I thought it was tomato salsa," does that mean that the salsa is pink? That would be Thousand Island Dressing, which is pink because of the tomato sauce in it.

Nutrition shouldn't be analyzed in terms of the sauce you're talking about, but in terms of what nutritious food you can make with it, or what you like to eat.

Tomato salsa, you can have spaghetti, fries, omelets, fried rice ...... many, many more!

Salad dressings, you can make salads, of course salads are just a lot of ah, vegetable, seafood, ham and potatoes, corn and green beans, many, many! And now salad dressing is used in baked bread, sushi rolls, and so on in the field of innovation is also quite a lot, as long as you like, there is no boundary, because of itself is the egg and oil, so I have also seen someone to do a good job of white rice with vegetables, salami and other ingredients, after which the top of the into a net shape of squeezed into the salad dressing, baked into a light yellow can be made, look also good o!

Said here you probably have an understanding of the two ingredients, do not understand and then ask.