Machine needles are specialized tools used in sewing machines to create stitches in fabric. They come in various sizes and types, each designed for specific materials and sewing techniques. The needle's sharp point penetrates the fabric, while the eye of the needle holds the thread, allowing it to form stitches as the machine operates. Different types of machine needles include universal needles, ballpoint needles, and quilt needles, each serving unique purposes. For example, ballpoint needles are ideal for knit fabrics, while quilt needles are designed for multiple layers of fabric. Choosing the right needle is essential for achieving the best sewing results.