• Point (punto)                    

−      A point is the place where two lines intersect.
−      In geometry, a point has no dimension
−      We represent a point with a dot.
−      We identify this point with a CAPITAL letter.

  • Line (línea)
−        A line is made up of infinite points.
−        It has not endpoints and continues endlessly on a plane. 
−        These lines are named with small letters such r ,s, t...
  • Ray (semirrecta)
−      A ray is a "straight" line that begins at a certain point and extends forever in one direction.
−      The point where the ray begins is known as its endpoint.
  • Line segment (segmento)
−        A line segment is a portion of a "straight" line.
−        A line segment does not extend forever, but has two endpoints.


−      The point halfway between the endpoints of a line segment is called the midpoint.  A midpoint divides a line segment into two equal segments.


  • Intersection


−        The term intersect is used when lines, ray lines or segments share a common point.
−        The point they share is called the point of intersection.
 

And here you can find a video explaining the differences between line, line segment and ray.