Krypton and Xenon are both gases and elements. They are both noble gases, meaning they are chemically unreactive and have low boiling points. Krypton is a colorless, odorless gas that can be found in the Earth's atmosphere in trace amounts. Xenon is also a colorless, odorless gas that is found in the Earth's atmosphere in even smaller amounts. Both of these elements are used in a variety of applications, such as lighting, lasers, and medical imaging.