system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What is 'cold working' & 'hot working'?

In terms of metal works, etc. I've also read the term 'the rivet is driven cold'. What is it? How is it done?
gpt
It very simply refers to the temperature a metal is worked at. Cold working means simply working the metal as it is, hot working means working it when it's hot.

Hot working obviously requires the metal to be heated, but makes it softer, as well as leaving less residual internal stresses behind (by heating the metal, internal stresses can be allowed to resolve). Cold working typically creates internal stresses.