Alt Layer 1
A blockchain is a database of unchangeable records of data that is shared across a network of computers. All these records are blocks of data that are secured and bound to each other with the help of cryptographic principles (i.e. chain). Once a “block” has been added to the “chain” it is very difficult to change, because all the computers have to change.
Cardano vs Solana. They’re known as version 3.0 blockchains and represent the next developmental iteration after Ethereum.