Energy is the ability to do work.
For example, the food you eat contains chemical energy, and your body stores this energy until you release it when you work or play. All forms of energy are stored in different ways, in the energy sources that we use every day. These sources provide us the energy we need to live our busy lives. We use all these energy sources to generate the electricity we need for our homes, businesses, schools, and factories. We use energy to run our cars.