The difference between venting emotions and combing emotions is that the former can't control emotions, while the latter can control emotions. When an emotion occurs, there is a qualitative difference whether you are conscious or not.

Venting our emotions means that we are unconscious, so we will suppress our emotions, or subconsciously express them in negative ways, or move to other places.

Venting emotions means that sometimes in the process of communication, we realize that we have emotions. We speak louder, we speak faster, and we realize our emotions.

In this case, emotions will be attached to our words and deeds, expressed in disguised form, and our behavior will be out of control.

We think we are expressing our own content, but in fact we are subconsciously expressing our emotions. Others don't know why we are like this and become unreasonable.