I have to disagree with the poster who said the walking foot is also known as the quilting foot. The walking foot helps you feed fabric IN A STRAIGHT LINE ONLY. When you attach it to your machine, you are essentially adding feed dogs to the top of your fabric. Feed dogs on both bottom and top of your sewing will help feed your pieces evenly. You CAN quilt with this foot, but only in a straight line, or (if your walking foot has a wide enough needle hole) using your machine's decorative stitches.
However, if you want to do some free motion quilting, which means moving the quilt in all directions to make swirls or whatever, you will want to drop your feed dogs and put in a different foot. This foot has several different names; free-motion foot, darning foot, quilting foot. Some people call it a hopping foot because it hops as it sews. The reason it hops is because it has to lift between stitches so you are able to move the fabric in all different directions. If your foot does not lift or hop, you will not be able to do any free motion quilting on your machine.
Hope this helps.