What is the source of infrared waves? Where are they used?

The source of IR waves is any heated body, most of the radiation from incandescent lamps, gas-discharge lamps, and the radiation of some lasers. And also about half of the Sun’s energy is emitted in the infrared range.They are widespread in human life and have found their application in various fields:
• Warfare. Modern missiles and self-guided warheads are equipped with night vision devices, which are the result of the use of infrared radiation.
• Thermography. Infrared radiation is used to study overheated or overcooled areas. Infrared images are also used in astronomy to detect celestial bodies.

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