Hello, The law of conservation of energy is one of the most basic laws of nature. It states that energy can never be created or destroyed, it can only be transformed from one form to another.
@innia Well done ! Keep it up!
I want to add some examples.
(1) If an object is at some height from ground level it has only potential energy. When it falls freely its potential energy decreases with decrease in height and kinetic energy increases. The PE is converted fully into the kinetic energy of the body, just before touching the ground.
(2) Electric energy is converted into light energy and heat energy in an electric bulb.
@Swetha hope you got it.