- 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.
− 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.