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In basic terms, a lock stitch is a type of stitch created by interlocking two threads the upper thread (needle thread) and the lower thread (bobbin thread). This stitch type is named “lock stitch” because the interlocking action keeps the threads locked in place, which provides strength and stability to the seam. The lock stitch is commonly produced by home sewing machines and industrial sewing machines, making it one of the most widely used stitch types in various sewing projects.