Identifying a transformation
A transformation or a mapping is a one-to-one correspondence between points in a plane. When an object in a plane undergoes a transformation,
every point of the object corresponds to a movement of a similar manner
in the diagram, every point of the triangle ABC moves in the same manner of 4 units to the right followed by 2 units downwards to form the triangle A'B'C' .
The movement of ABC to A'B'C' is known as a transformation or a mapping.