Rome's public transit card is the BIT ticket / Roma Pass.
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Rome uses the BIT ticket / Roma Pass. A single BIT ticket covers 100 minutes of bus, tram, or metro travel; the Roma Pass adds museum entry if you're sightseeing heavily.
You can buy it at metro stations, tobacco shops (tabacchi), or newsstands.
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.