Collinear Points :

Collinear points are the set of points that lies on the same straight line. In the term collinear, co refers to togetherness and linear refers to line. So collinear refers to the points that hang on the same line together. The point that does not lie on the same line is called as non-collinear points.

Example :

Real life example would be clock, when clock strikes six, we can see the small and long arrow form collinear points.