For a more detailed (and technical) description of blackbody radiation, see this online textbook.
Infrared radiation has many, many uses in the modern world. See this interesting blog post about using the infrared cameras to detect gas leaks. [Spoiler alert: the ability to "see" these gases in the IR is the same reason that these gases warm the planet]
One of the scariest fire demos you'll ever see. In this fire demo, as fire moves across the ceiling, the flames heat objects on the floor by infrared radiation. When the floor gets hot enough it burst into flames -- known as flashover. You do not want to be in the room when that happens.