By generally accepted definition a Quilt is made up of three layers.
The top layer may be patchwork or plain.
There is a middle layer of wadding, sometimes called batting.
And finally a backing; for smaller quilts this is usually in one piece, but for larger quilts may have to be joined.
Quilting holds the three layers together.
If your top layer is plain, the quilting design becomes the main feature; this is known as Wholecloth Quilting.