Paris has 2+1 international airports now.
Roissy CDG. That's where you're likely to touch down when you come from the Americas (except for French Guiana, Martinique or Guadeloupe), Australia, Asia and so on.
It's the major world class airport here, and I'm sure a bunch of you guys had to go through it already.
Orly. Some European destinations + French overseas regions, such as those mentioned above.
And the latest, "Beauvais–Tillé Airport", mostly Euro + North African destinations, I believe.
Remote and meant for low-cost flights. It's cheaper, thus interesting to travel from there, but it's so annoying to get to it that I've never seen the new airport yet. In fact, I simply never went to Beauvais, as far as I go.
But it's surely something to increase competition locally, then airline tickets are cheaper and cheaper.
That's how Air France (when those laughable morons are not on strike) set up a low-cost subsidiary of theirs, 'Joon'. That's actually a South Korean female first name, but whatever.