Satin stitch is a type of embroidery stitch that creates a smooth, shiny surface, resembling satin fabric. It is commonly used to fill in shapes and letters, providing a rich, textured look. The stitch is made by closely placing parallel stitches side by side, which helps to cover the fabric underneath completely. This technique is popular in various needlework projects, including embroidery, appliqué, and monogramming. Satin stitch can be done by hand or with a sewing machine, making it versatile for both beginners and experienced crafters. Proper tension and stitch placement are essential for achieving a polished finish.