Cardano is a blockchain platform launched in 2017 by a team that included one of the co-founders of Ethereum. It was built around a strong emphasis on academic research, with many of its features going through peer review before being implemented, a more methodical approach than many other blockchain projects take.
Cardano uses a proof-of-stake consensus mechanism called Ouroboros, designed to be energy efficient while still maintaining strong security guarantees. Its native token, ADA, is used to pay transaction fees and can be staked by holders to help secure the network and earn rewards.
The project has positioned itself around use cases including identity verification and supply chain tracking, with particular attention to building infrastructure for developing regions. Development has historically proceeded through clearly defined phases, each adding new capabilities to the network over time.