Sewing Machine Basics

I get this question so often its amazing.
Q: How does a Sewing Machine Work?
A: A sewing machine combines two separate threads to make each stitch. The top thread is fed through the fabric by a needle and looped with the bobbin thread to form a stitch. The fabric is guided through the machine by hand, and held firm by a presser foot. Very simple we just have to find you the right machine.

in reference to:

"Q: How does a Sewing Machine Work? A: A sewing machine combines two separate threads to make each stitch.  The top thread is fed through the fabric by a needle and looped with the bobbin thread to form a stitch.  The fabric is guided through the machine by hand, and held firm by a presser foot."
- FAQ's (view on Google Sidewiki)