What is meant by transformation of energy?

What is meant by transformation of energy? Explain with the help of two suitable examples.

One form of energy can be converted into other forms of energy, this phenomenon is called transformation of energy.
e-g-
(i) When we throw a ball, muscular energy which is stored in our body, gets converted into kinetic energy of ball.
(ii)The wound spring in the toy car possesses potential energy. As the spring is released, its potential energy changes into kinetic energy due to which, toy car moves.