Cheese curds can be consumed as a finger food or added to different recipes. People in Wisconsin are known to mix them into a beer batter and deep-fry them. What is this? After they're deep-fried, they're mostly served with jalapeno peppers and sour cream.
Cheese curds are very typical of US Cheddar production, and they are just what the name implies: pieces of the curd prior to the moulding process that will lead to a cheese block. Mozzarella sticks are a totally different type of cheese because it's stretched curd cheese type.