What's Leblanc Role in the Team?

I am not asking what's Leblanc role in the teamfight, I am asking, what is her role in the game, I am starting to main Mid Lanne and I love LeBlanc Kit, I would LOVE to know what's her role in a Team, she search for potential Kills? She Splitpushes (plz it's not this, right?) ? What she does in the game?
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