A serger is another type of sewing machine. It has 4 cones of thread on it. You can use 4, 3, or 2 cones. It also has a blade (or knife as it is called) that also cuts the excess fabric off as you sew. You sew like you would with a normal sewing machine. But the serger wraps the threads around the edge of your fabric. Looks just like store bought stuff. Gives it a nice finish & keeps it from fraying. Good luck.
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