How Do Thermal Imaging Goggles Work?

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Movies like Predator reveal how useful thermal imaging goggles can be, but why do hot objects give off infrared radiation to begin with?

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Sources:

http://galileo.phys.virginia.edu/clas...
http://astronomy.swin.edu.au/cosmos/B...
https://electronics.howstuffworks.com...
https://www.smithsonianmag.com/smiths...
https://www.britannica.com/science/li...
https://www.sciencedirect.com/science...

Images:

http://www.thinkstockphotos.com/image...
https://en.wikipedia.org/wiki/File:Th...
https://en.wikipedia.org/wiki/File:EM...
https://en.wikipedia.org/wiki/File:Bl...
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