Barcelona's public transit card is the T-Casual / Hola BCN card.
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Barcelona uses the T-Casual / Hola BCN card. The T-Casual (10 rides) is the best value for most visitors; the Hola BCN card offers unlimited rides for a set number of days.
You can buy it at metro station ticket machines.
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.