A sidechain is a separate blockchain that runs alongside a main blockchain, like Bitcoin or Ethereum. It’s connected through a two-way peg, which lets users move assets between the two networks securely. Sidechains allow for faster, cheaper, or more private transactions without changing the main blockchain.
They’re used to test new features, reduce congestion, and add functionality like smart contracts. Projects like Polygon, Liquid Network, and RSK are real examples of sidechains in action—helping blockchains scale and evolve while keeping the main network safe and stable.
