Until a few years ago, blockchains were unable to communicate with each other. Someone with bitcoins couldn't send bitcoins to Ethereum and vice versa. In a way, it's as if a Gmail user couldn't send emails to someone using a Hotmail address. Clearly, they don't speak the same language.
This wasn't too much of a problem up until 2021, but with the rise of alternative blockchains (Solana, Avalanche, etc.) and Ethereum's secondary layers (Polygon, Arbitrum, etc.), it has become essential to offer the same services to all users.), it has become essential to offer transmission belts between protocols so that you can use your cryptos anywhere and not necessarily on their native protocol.
Bridges have gradually established themselves as the solution to this problem.









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