These are general explanations.
Other ranges may define conditions more narrowly.
A cold range is a range on which all firearms are to be unloaded at all times, unless the shooters are actually standing on the firing line.
A hot range is a range on which all firearms are (presumed to be/allowed to be) loaded at all times.
As noted - there may be other variations on these definitions.
Treat everyone you meet with dignity and respect....but have a plan to kill them just in case.