Explanation.
1. Draw a point C not on line AB.
2. From point C, draw a line segment CD that intersects line AB at a right angle.
3. Using a compass, set the width of the compass to the length of segment CD.
4. Without changing the width of the compass, place the compass on point D and draw an arc that intersects line AB at two points, E and F.
5. From points E and F, draw line segments EF that extend beyond line AB.
6. The line segment EF is parallel to line AB.
Please refer to the figure or consult a visual resource for a more accurate understanding of the construction.