Rio de Janeiro's public transit card is the RioCard.
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Rio de Janeiro uses the RioCard. The RioCard covers the metro, which is the safest and most efficient way to move between major tourist areas.
You can buy it at metro stations.
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.