Rootstock's native token RBTC is known as "Smart Bitcoin” and lets users use their BTC to interact with a range of services on the Rootstock Bitcoin layer 2.
WRBTC is an ERC20 token that wraps RBTC. Both are on the same network, RSK. This is accomplished using a smart contract. It is a 1:1 equivalent of RBTC.
WRBTC is to trade RBTC for other ERC-20 tokens on decentralized platforms. Because decentralized platforms running on RSK use smart contracts to facilitate trades directly between users, every user needs to have the same standardized format for every token they trade. This ensures tokens don’t get lost in translation.