How is thermal radiation different from infrared radiation?

Question

Physics

Please tell me what is the difference between thermal radiation and infrared? I always thought it was the same thing, but there are 2 different articles on the wiki:
https://ru.wikipedia.org/wiki/Infrared_radiation
https://ru.wikipedia.org/wiki/Thermal_radiation
Which are in the article about electromagnetic radiation are combined in one section called "Infrared radiation (thermal)".
Please explain as clearly as possible and in simple words, what exactly is the difference?
upd: It is clear that infrared radiation is thermal radiation. Is the reverse true? Are ultraviolet and visible, for example, considered part of the thermal?

Answer 1

The concept of "thermal radiation" has two meanings.
The first meaning is related to the nature of radiation. Calling some kind of radiation thermal, one can point to the fact that it arises due to the fact that the given body is heated (in other words, that it arises from the internal energy of the body). For example, the radiation of an incandescent lamp (which we see and which we do not see) in this sense is thermal, since it has a thermal nature (the lamp coil is heated by current). As opposed to it, there is non-thermal radiation that occurs in non-equilibrium systems (this is a separate story about plasma, etc.).
The second meaning is radiation, which belongs to the so-called thermal subrange of infrared radiation. Otherwise - long-wave infrared study. This range is called so because bodies whose temperature is only slightly higher than room temperature have a peak of their own radiation in this range in accordance with one of the laws describing the dependence of the peak of the radiation spectrum of a body on its temperature (Planck, Kirchhoff, Stefan - Boltzmann).
The ability of radiation with any wavelength to heat bodies does not depend on the wavelength itself (well, that is, it depends, but not in such a way that long-wave infrared is more capable of heating something), because any radiation carries energy, and the more, the more shorter wavelength.
This ability depends on the ability of the body itself to absorb radiation of this wavelength, that is, to take away this energy for itself, and not to reflect or transmit radiation. If the absorbance is high (and many materials at this wavelength have it), the body heats up easily. But if you imagine a material that will reflect long-wave infrared radiation, but, for example, absorb ultraviolet radiation, then such a material will be heated by ultraviolet radiation, not infrared.

Answer 2

Directly on your links in the wiki and it says
"Infrared radiation is also called "thermal" radiation"

Answer 3

Thermal radiation has a wide spectrum and is associated with the loss of energy by matter.
Infrared radiation has a specific wavelength and is associated with the processes occurring inside the substance (forced vibrations).
Thermal radiation has a higher wavelength than infrared and lies farther from the visible spectrum than infrared.