For many quilters, machine quilting is a way to quilt those tops that seem to go together faster than they can be hand quilted. For others, machine quilting is a means of self expression. Machine quilting can range from an almost invisible stitch outlining the quilt blocks to a combination of threads and stitches creating a one of a kind work of art and everything in beween.
"Machine Quilting is the process of using a home sewing machine or a Longarm machine to sew the layers together. With the home sewing machine the layers are tacked together before quilting. This involves laying the top, batting and backing out on a flat surface and either pinning (using large safety pins) or tacking the layers together. Longarm Quilting involves placing the layers to be quilted on a special frame. The frame has bars on which the layers are rolled, keeping these together without the need for basting or pinning. These frames are used with a professional sewing machine mounted on a platform. The platform rides along tracks so that the machine can be moved across the layers on the frame. A Longarm machine is moved across the fabric. In contrast, the fabric is moved through a home sewing machine." -- Quoted from Wiki