Crewel embroidery is a type of hand embroidery that uses wool yarn to create intricate designs on fabric. This technique often features floral patterns and other decorative motifs, making it popular for home decor items like cushions and wall hangings. The use of wool gives the embroidery a unique texture and richness. The stitches used in crewel embroidery can vary, but they typically include back stitch, chain stitch, and French knots. This craft has a long history, dating back to the Middle Ages, and has evolved over time, influencing various styles and techniques in the world of embroidery.