You get a delicious glass of chocolate milk. Matter can change. If you have a piece of square paper and you decide to cut it in an oval shape, a physical change has just happened. If you decide to burn the paper, the paper became ash. This change is a chemical change.
Energy is everywhere.
We can watch television and play CDs because of the energy that the electricity produces. We can run, play and study because our bodies convert the food that we eat into energy. In our planet Earth, the Sun is the major source of energy. We need the heat of the sun to grow plants, which provide the food that we eat. The Sun also evaporates the water that falls as rain to water the plants.