Bangkok's public transit card is the Rabbit Card (BTS).
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Bangkok uses the Rabbit Card (BTS). The Rabbit Card covers the BTS Skytrain; the MRT subway uses a separate card — between them and app-based taxis, you rarely need a car.
You can buy it at BTS Skytrain 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.