Lines

http://www.mathsisfun.com/geometry/line.html 

In geometry a line: is straight (no curves), has no thickness, and extends in both directions without end (infinitely).

A line has no ends!

Line Segment

If it does have ends it is called a "Line Segment".

Ray

If it has just one end it is called a "Ray"

Point, Line, Plane and Solid A point has no dimensions, only location A line is one-dimensional A plane is two dimensional A solid is three-dimensional