A purl stitch is one of the basic techniques used in knitting. It creates a textured pattern that is the opposite of a knit stitch. When you purl, the working yarn is held in front of the needle, and you insert the needle from back to front through the stitch. This action forms a loop that creates a bump on the fabric's surface. Purl stitches are often used in combination with knit stitches to create various patterns and textures in knitted items. They are essential for making ribbing, seed stitch, and other decorative designs. Mastering the purl stitch is crucial for any knitter looking to expand their skills.