The term "lockstitch" refers to a basic sewing stitch that creates interlocking loops to secure two pieces of fabric together. There are various synonyms for lockstitch, including interlock, chain stitch, and straight stitch. However, these stitches are not exactly the same and have unique characteristics. The interlock stitch creates a strong seam that is ideal for heavy fabrics, whereas the chain stitch is good for decorative stitching. The straight stitch is a basic stitch used for sewing seams and hemming. Each variation of lockstitch offers different benefits and is used depending on the fabric and project at hand. Understanding the various synonyms and their unique qualities will help you achieve a perfect seam every time.