History 101

So, I might be a little behind the eight ball on this one but I thought I'd give you a little bit of a history that I found on the salsa. This information comes from everyone's favorite, Wikipedia, so take it as you will.

The term "salsa" simply means sauce in Spanish and is used to refer to many different varieties of product.
The first is pico de gallo, which is a cold salsa that is made up of coarsely chopped vegetables. These can contain chilies, tomatoes, onions, and cilantro. This variety does not use any vinegar or tomato paste product, unlike it's more common relative. Just a little fun fact for you, "pico de gallo" means rooster's beak.
The more common salsa, as we know it, is a mixture of uncooked vegetables, blended with tomato paste, and finally vinegar. The tomato paste and vinegar add to the sauciness of the salsa.
There is also a green chili version of salsa called "salsa verde". This one uses tomatillos instead of tomatoes and sometimes excludes both.
Finally there is a "salsa picante" which is a very thin vinegary substance. This is made up of pureed red peppers and tomatoes blended with spices. This is very common to be used to top off a dish to add extra heat.