Cardano is a blockchain platform based on the POS consensus mechanism. It is the first blockchain platform based on peer review research and evidence -based methods. It combines advanced technology to provide unparalleled security and sustainability for decentralized applications, systems and society. Cardano was originally founded in 2017 by Charles Hoskinson and named after the name of the 16th -century mathematician Gerolamo Cardano, Italy.Cardano's internal token is ADA, which is used to pay trading costs on the network and motivate nodes to maintain network security. Cardano's development is divided into five stages, namely Byron, Shelley, Goguen, Basho, and Voltaire. Each stage has different goals and functions. At present, Cardano has completed the Byron and Shelley stage, realizing decentralized equity proof network, and is undergoing the Goguen stage, which aims to introduce smart contracts and decentralized applications. Cardano's goal is to become a platform that supports social and financial system changes, and it can support projects with various scale and complexity.