Answer:Parallel Lines: Definition and Examples Parallel lines are two or more lines in a plane that are always the same distance apart and never meet, no matter how far they are extended. They run in the same direction and never intersect. Here are some examples: - Railroad tracks: The two rails of a railroad track are a classic example of parallel lines. They maintain a constant distance from each other and never cross. - Opposite sides of a rectangle: A rectangle has two pairs of parallel sides. The top and bottom sides are parallel, and the left and right sides are parallel. - Lines on a notebook: The horizontal lines on a notebook page are parallel to each other. - Street lines: Many streets in cities are designed with parallel lines for traffic lanes. - Stair railings: The vertical supports of a staircase railing are typically parallel. These are just a few examples. Many objects and designs in the world incorporate parallel lines to create structure, stability, and visual appeal.