what is bias binding

Bias binding, also known as bias tape, is a strip of fabric that is cut on the bias, which gives it a little stretch and enables it to gently curve around an edge or seam. It is often used to finish raw edges, such as armholes and necklines, and can create a bound edge that is visible. Bias binding can be single fold or double fold, and it is used for various sewing applications, including binding quilts, garments, and other fabric items. It is made by joining strips of fabric cut on the bias at a 45-degree angle to the straight grain of the fabric