What are heat rays?

(N/A) Heat rays,also known as thermal radiation,are electromagnetic waves emitted by an object due to its temperature.
These rays are primarily in the infrared region of the electromagnetic spectrum,typically with wavelengths ranging from $700 \ nm$ to $1 \ mm$.
Unlike conduction and convection,heat rays do not require a material medium for propagation and can travel through a vacuum at the speed of light $(c \approx 3 \times 10^8 \ m/s)$.
All objects at a temperature above absolute zero $(0 \ K)$ emit these rays.