Paris's public transit card is the Navigo Easy.
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Paris uses the Navigo Easy. The reusable Navigo Easy card works for metro, bus, and RER — load individual tickets (a carnet of 10) or a day pass depending on how much you'll ride.
You can buy it at any metro station ticket machine or RATP window.
Usually yes — it's typically faster than buying paper tickets and often cheaper per ride, even for just a couple of days.
In some cities you can tap a contactless card or phone directly, though it's worth checking current signage or the transit authority's site, since not every system supports it yet.