Energy is the ability of a system to do work. Energy cannot be created or destroyed. It can only be transformed into different forms.
Potential energy is stored energy. Stored energy has the potential to do work.
Kinetic energy is energy in motion. The word kinetic comes from the Greek word kinetos, which means moving.
Gravitational potential energy is potential energy due to an object's position. An example of gravitational potential energy is a boulder at the top of a hill.
Anything that can act like a spring or rubber band has elastic potential energy. Elastic potential energy is energy due to compression or expansion of an elastic object or spring.
Chemical potential energy is potential energy stored within the chemical bonds of an object. A chemical bond can be thought of as an attractive force between atoms. When these bonds are broken, energy is given off.