The reason why Infrared waves are called infra red waves its because the frequency is just below visible red light.
Infrared light gives off heat.
Uses and Dangers
|A Picture of Infrared Camera (Thermal Imaging)|
The users are used for remote controls for TVs and video recorders, and physiotherapists use heat lamps to help heal sports injuries. Also, they are used night-vision goggles or infrared cameras allow us to detect the infrared waves emitting from warm objects such as humans and animals.
The danger to people from too much Infra-Red radiation is overheating.