In contrast to Dai which is a stablecoin that is suitable for payments and savings, MKR is a token that has a volatile price because of its unique supply mechanics and role on the Maker platform. MKR is a utility token, governance token and recapitalization resource of the Maker system.
Maker is a smart contract platform on Ethereum that backs and stabilizes the value of Dai through a dynamic system of Collateralized Debt Positions (CDPs), autonomous feedback mechanisms, and appropriately incentivized external actors. Maker enables anyone to leverage their Ethereum assets to generate Dai on the Maker Platform. Once generated, Dai can be used in the same manner as any other cryptocurrency: it can be freely sent to others, used as payments for goods and services, or held as long term savings. Importantly, the generation of Dai also creates the components needed for a robust decentralized margin trading platform.