Energy travels in the form of electromagnetic waves which are waves with both electrical and magnetic properties. The Law of Conservation of Energy, which states that energy is neither created or destroyed, can be applied to the concept of electromagnetic waves. Electromagnetic energy can transfer heat from warmer objects to cooler ones, but the quantity never changes. The transfer of energy through these waves is called radiation.
The electromagnetic waves that humans can see fall under the classification of visible light. When all visible light overlaps, it appears as white. The longest visible light is red and the shortest visible light is violet. Ultraviolet light is light that has a shorter wavelength than violet light and Infrared light is light that has a longer wavelength than red light.
Some objects appear to radiate light, but instead what you are seeing is reflection. Light bounces off these objects. Albedo is a measurement that describes how much light reflects off a surface. White objects have high albedo.