What do we call lines that do not intersect?

Lines that do not intersect are referred to as parallel. Parallel lines run in the same direction and maintain a constant distance from each other, so they will never meet, regardless of how far they are extended. This characteristic is essential in various fields, including geometry and real-world applications like engineering and architecture.

In contrast, perpendicular lines intersect at a right angle, and converging lines eventually cross at some point. Intersecting lines, as the name suggests, do meet at a point. Thus, the definition of parallel lines is crucial, as it identifies a specific relationship between lines that ensures they remain equidistant and non-intersecting. Understanding this concept is fundamental in both geometric properties and practical situations where measurements and layouts require precision in maintaining distances.