Well collinear points and points that are on the same plane.
For example, in this picture A B D are collinear, but A B and D can also be collinear with C. Points are just collinear if you can draw a straight line through them without bending or curving.
For example, in this picture A B D are collinear, but A B and D can also be collinear with C. Points are just collinear if you can draw a straight line through them without bending or curving.