Consider the diagram
Lines AC and RS are
Coplanar
Parallel
Perpendicular
Skew

Line AC and RS are in different plane and they do not intersect, hence they are skew lines.
A point is a location and it has no magnitude. A line is defined as something that extends infinitely in either direction. A line is the shortest distance between two points.
Skew lines are two lines that do not intersect and are not parallel. Hence the two lines do not exist in the same plane.
Line AC and RS are in different plane and they do not intersect, hence they are skew lines. They are not parallel also.
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