Can’t find simple definitions

I’ve been reading the emails from TechRepublic about PC refreshes, vs. upgrades.

Alas, I just don’t know the definition of either one in relation to the other. And all I can google up are definitions about refreshing dynamic RAM, monitors, web pages, etc.

I’ve performed dozens of reformats, and I think perhaps I just did a “Bare Metal Upgrade” when I got a new mobo and processor, and then migrated all my other old hardware onto it.

But I’ve never heard either of these terms, and wonder how I managed to get myself certified without knowing what these things mean.

Any help with definitions would be greatly appreciated.

Thanks.