Linea is a network that scales the experience of Ethereum. Its out-of-the-box compatibility with the Ethereum Virtual Machine enables the deployment of already-existing applications, as well as the creation of new ones that would be too costly on Mainnet. It also enables the community to use those dapps, at a fraction of the cost, and at multiples the speed of Mainnet.
It does this by leveraging quantum-resistant lattice-based cryptography to create zero-knowledge proofs that include every transaction performed on the network, and rolling them up to Mainnet. This ensures that every transaction is recorded to the Ethereum ledger while dividing the cost of that security by magnitudes.