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Backstitch is
a sewing technique that involves making small up and down stitches with the purpose of tightly join two cloth pieces together. This method provides durability and prevents the material from unraveling. The join together can be used for a variety of stitching projects, including sewing the hem, sewing patches, or even creating quilts. It provides a clean and skilled look for the completed piece.
Whipstitch Definition Meaning MerriamWebster