When you sew a fabric, the seam has a beginning and an end. It's critical to keep an eye on these points to make sure they don't unravel and stretch out into other forms. Your stitching must be neatly finished. A backstitch and a lock stitch can be used to secure the beginning and end of a seam.
Backstitching is just backward and forward stitching done at the start and finish of a seam to keep it sturdy. Lock stitching, on the other hand, is a built-in stitch function in most sewing machines that makes a single stitch on the fabric without repeating it both forward and backward.