The intersection of two lines is called a point. For two lines to intersect each other, they must lie in the same plane. If two lines do not lie in the same plane they can never intersect each other.
When two lines lie in the same plane they are called coplanar lines. There are only two possibilities for two distinct coplanar lines; either the lines intersect or are parallel lines. Two lines lying in the same plane can have only one point of intersection. Lines that do not lie in the same plane are called skew lines.
A line is a set of infinite points. It has no thickness or width but has infinite length. It is represented by taking any two points on the line or by assigning a small letter such as line l or line m.