What is chain stitch and lock stitch?

What is the difference between lock stitch and chain stitch?

Chain stitch strength is higher than the lock stitch. Lock stitch strength is lower than the chain stitch. At the top of the stitch, it appears like a lock stitch and at the bottom, it looks like a double chain. On both sides of the stitch, it appears the same.

What is a lock stitch?

: a sewing machine stitch formed by the looping together of two threads one on each side of the material being sewn.

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