There are energy transfers going on all the time - whenever a system changes there is a change in the way some or all of the energy is stored.
A swinging pirate ship ride at a theme park.
Energy is transferred by one of the following four types of energy transfer:
Doing 'work' is the scientific way of saying that energy has been transferred. For example, a grazing cow, a firing catapult and a boiling kettle are all doing 'work', as energy is being transferred.