What makes a quilt?

The National Quilt Register definition is a bedcover of 2 or more layers sewn together (or tied) either by hand or by machine. It is often but not always quilted. A quilt may be made for decoration or warmth or both. This link will take you to the web page of the NRQ which has an interesting diagram called the "Australian Quilt Tree". It shows the various methods and materials which may have be used to construct an Australian wagga quilt.