This method of binding is most suitable for rectangular quilts that don’t have curved or complicated edges. The binding can be cut crosswise from the fabric, and is not sewn together into one continuous strip as in bias binding. It is attached to the quilt by aligning the raw edge of the binding...
This is the grain that runs at a 45 degree angle to the straight grains, or the warp (lengthwise) and weft (crosswise) grains. Cutting along the bias results in a fabric that is slightly stretchier than the warp or weft, and is often used for binding a quilt.