A line may be described as a set of points going straight on forever in two opposite directions, and they are straight and never end. A line segment is the set of any two points on a line that are the endpoints. Then a ray is a set of collinear points going in 1 direction with one endpoint. So a line is <-----> and segment is .----. (the periods are endpoints) and .----> To be frank, the differnce between a line segment and a ray is a line segment has two endpoints and stays within those endpoints and a ray has one endpoint and continues continuously in the direction opposite of the endpoint. Then the difference between a line and line segment is that a line is never-ending and and goes in two directions in a straight line, and a line segment has two endpoints and stays within them