Which of the following best describes parallel lines?

Parallel lines are defined as lines in a plane that are always the same distance apart and never intersect. This characteristic ensures that no matter how far they are extended in either direction, they will never meet or cross each other. This definition is a fundamental aspect of geometry, particularly in understanding the properties of various geometric shapes, such as rectangles and parallelograms, where parallel lines are a key feature.

The other descriptions provided do not accurately capture the essence of parallel lines. For example, lines that intersect at one point or lines that cross each other indicate that those lines are not parallel, as they either meet at a certain point or overlap. Similarly, the description involving lines that form a right angle refers to perpendicular lines, which also contradicts the definition of parallel lines since perpendicular lines indeed intersect. Thus, the correct option effectively defines what parallel lines are in relation to their spatial characteristics.