What is Cardano?
Cardano is the blockchain platform on which ADA cryptocurrency runs. It is an open source public platform which is mainly used for making smart contract,multiparty computation and decentralized apps ; and has the most advanced protocols.
Cardano was invented by nput Output Hong Kong (IOHK) which a blockchain based development firm. Its initial release was in September 2017. It works on a proof of stake algorithm unlike most of the others which work on proof-of-work algorithm.
Link : https://www.cardano.org/en/home/