What is a quilt block?

A quilt block is best defined as a pieced patch of fabric that combines with other blocks to create a complete quilt. Each block typically features a unique design or pattern and is constructed from various pieces of fabric stitched together. Once a quilter produces multiple blocks, they can be arranged and sewn together to form the larger quilt top. This process not only allows for creativity and personalization in quilt designs, but it also adds structural integrity to the quilt as a whole.

The other choices do define aspects of quilting but do not accurately describe what a quilt block is. A single piece of fabric, while it may be part of a quilt, does not encompass the concept of piecing and arranging that defines a quilt block. Similarly, a type of stitch is essential in the quilting process, but it is not related to the concept of a quilt block itself. Lastly, a design for arranging fabric pieces is relevant to quilt making but does not specifically describe the component that is a quilt block. Thus, the definition provided by the correct answer encompasses the fundamental elements of what a quilt block represents in the quilting process.