Regional Terminology
The term 'preserves' is usually interchangeable with 'jam'. Some cookbooks define preserves as cooked and gelled whole fruit (or vegetable), which includes a significant portion of the fruit.
The terms 'jam' and 'jelly' are used in different parts of the English-speaking world in different ways. In the United States, both jam and jelly are often referred to as 'jelly'. Elsewhere in the English speaking world, the two terms are more strictly differentiated and, when this is not the case, the more usual generic term is 'jam'.
Read more about this topic: Fruit Preserves