Everyone sees what they want to see. Anon is blind, always.

The contemporary use is from management theory.

It was a metric made up to measure management candidates. From there it got into the self-help industry, and now that's why everyone posts it on their dating profiles, because are looking for someone to manage their emotions for them.

I usually think of it in terms of recognizing others' emotions and adjusting your words/actions to better cooperate or de-escalate