Heat energy is the term that we use to describe the level of activity for the molecules in an object. An object with molecules that are very excited and zip around rapidly is known as being hot, while an object with molecules whose atoms move around less rapidly is known as cold.
Here are some examples of heat energy.
So now you have seen lots of examples of heat energy. The next time your pet climbs into your lap, you can see first hand how heat energy works and experience it for yourself.