Electromagnetic Waves

Step 1: Defining Ultraviolet Light.
Ultraviolet (UV) light is a form of electromagnetic radiation with a wavelength shorter than that of visible violet light but longer than X-rays. It typically falls within the range of 10 nm to 400 nm in the electromagnetic spectrum.

Step 2: Characteristic 1 - Chemical and Biological Effects.
One primary characteristic of ultraviolet light is its high energy, which allows it to induce chemical reactions. For example, it helps the human body produce Vitamin D but can also cause sunburn or damage to DNA in living cells.

Step 3: Characteristic 2 - Fluorescence.
UV light has the ability to cause certain minerals and chemicals to fluoresce. When these materials are exposed to UV radiation, they absorb the invisible energy and re-emit it as visible light, causing them to "glow."