The name infra-red means beyond red. There are waves just beyond the red end of the visible spectrum. In fact, all objects with temperatures above 0 K emit infra-red radiation.
When objects absorb infra-red radiation, they become hotter. This property of infra-red radiation is used to provide heat treatment for various illnesses.
We are not able to see in the dark because our eyes are sensitive only to the visible part of the electromagnetic spectrum. However, an infra-red camera, with special photographic films which are sensitive to infra-red radiation, can be used to take pictures in the dark without using a flashlight.
Infra-red radiation can also be used in intruder alarms. An intruder would unknowingly block the rays and set off an alarm.
One popular use of infra-red radiation today are the remote control devices for many electrical appliance via infra-red radiation which is produced by light emitting diodes (LEDs) inside the unit.
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