Question

What causes a lockstitch to form?

Answer 1

Answer: The lockstitch uses two threads, an upper and a lower. Lockstitch is so named because the two threads, upper and lower, "lock" (entwine) together in the hole in the fabric which they pass through. ... Then the take-up arm pulls the excess upper thread (from the bobbin area) back to the top, forming the lockstitch.

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Answer 2

Straight stitch is just a regular stich going in and back out, although a Lockstitch is similar to straight but the thread comes back around goes through itself to almost form a knot.