The word laser stands for Lightwave Amplification by Stimulated Emission of Radiation. A laser beam is a very strong (amplified) light beam (radiation) that is emitted (emission) from a tube which is designed to produce one specific color or wavelength of light. A complex electric method is used to stimulate (stimulated) the lighting into a strong amplified state. Medical and surgical lasers are designed to produce or create certain colors that are highly and specifically absorbed by different cells of the body. This technique is known as phototherapy or light treatment. When a laser beam strikes a tissue that is the appropriate color for that specific laser beam, the laser energy heats and destroys the tissue.