You're not far off. Quark is a fresh curd cheese, with a creamy texture somewhere between cream cheese and sour cream, and a mild, tangy flavor. It's lower fat than American cream cheese (so be warned, you can't use it as a perfect replacement for cream cheese), and a favorite food in Germany. But it's almost impossible to find outside of Germany, Poland, or Austria. Too bad, because it's an excellent, naturally lowfat, everyday food.
In Germany, I see quark most often served with potatoes- particularly dolloped on baked potatoes, sometimes with a sprinkling of chives or a side of smoked salmon. For breakfast, quark can be mixed with yogurt, berries and nuts. And it is often used in baking, including in German cheesecake (giving it a flavor very different from American style cheesecake!).