Which kinds of objects emit visible light in the electromagnetic spectrum?

The objects that are relatively hot emit visible light in the electromagnetic spectrum.

Explanation:

The electromagnetic spectrum refers to a continuum of all the electromagnetic waves. They are aligned on the basis of the wavelength and frequency. All the objects discharge wave on the basis of their temperature. The objects that are comparatively hot discharge the ultraviolet radiations or the visible light exhibiting greater frequencies, while the objects that are colder discharge wave of lower frequencies like radio waves. The visible light exhibits the wavelengths that lie between the ranges of 400 nm to 700 nm.

if you're asking what comes out, it's steam.