2 Lines in the same plane that do not meet are parallel.
If 2 lines are in different planes and do not meet, then they are called skew lines.
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Two perpendicular lines will meet in a right angle (90 degrees) if they exist on a flat plane.
Lines intersect if the meet at one point. Perpendicular lines also meet at one point, but their intersection is a right angle. Intersecting lines in the plane do not meet at two points.
Not necessarily. Two skew lines will not lie in the same plane. For example, consider you are standing in a cuboid room facing a wall. Then think of line 1 = the line where the floor and opposite wall meet. Line 2 = the line where two other walls meet. These two lines are not in the same plane.
They are parallel lines
coordinate plane