A sewing machine, in its essence, is a mechanical device designed to stitch fabric together quickly and efficiently.

1. Thread Setup: Polite sewing machines typically have two thread sources: the upper thread spool and the bobbin.
2. Threading: Polite sewing machines often have clear and intuitive threading paths, indicated by numbers or threading guides.
3. Tension Control: Polite sewing machines feature tension adjustment mechanisms for both the upper and lower threads.
4. Stitch Selection: Many modern sewing machines, including polite ones, offer a variety of stitch options.
5. Power Source: Sewing machines can be powered manually by a hand crank or treadle, or electrically through a motor.