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A cryptocurrency is a digital or virtual currency in which transactions are verified and records maintained by a distributed system using cryptography, rather than by a centralized authority.
Bitcoin is the first cryptocurrency, and whose technology, the blockchain, is used by the majority of all other cryptocurrencies.
The Smart Bitcoin (RBTC) is the token used to pay for the execution of transactions in RSK. More info here.
Tokens are the digital representation of an asset that resides in a blockchain; they could be fungible or not fungible, tradable and transferrable.
Stablecoins are a special type of token and by name, are quite self-explanatory, they are coins that are overall more stable. Unlike cryptocurrencies whose price fluctuates quite a lot due to various reasons, stable coins are coins whose value is pegged to some external reference. This could be a precious metal, fiat currency or crypto assets. More info here.