New Exp Tapping?

[Snowhawk]

What is Tapping?

I've heard it used before and about a year ago I was told that when a pet taps I lose Total EXP from the Kill, like sharing EXP, but a while back my Smokie hit a Vanberk and I got 0.03 instead of 0.02 like I normally did. I asked about it on main and they said it was because my Smokie tapped it.

So ya. Tapping = Attacking? And Why was I given contradictory info nearly a year apart?