Dai (or DAI, formerly Sai or SAI) is a stablecoin cryptocurrency on the Ethereum blockchain which aims to keep its value as close to one United States dollar (USD)
as possible through a system of smart contracts and the decentralized participants which those contracts incentivize
to perform maintenance and governance functions.
Dai is maintained and regulated by MakerDAO, a decentralized autonomous organization (DAO) composed of the owners of its governance token,
MKR, who may vote on changes to certain parameters in its smart contracts in order to ensure the stability of Dai

Cloud mining is the process of cryptocurrency mining utilizing a remote datacenter with shared processing power.
This type of cloud mining enables users to mine bitcoins or alternative cryptocurrencies without managing the hardware.
The mining rigs are housed and maintained in a facility owned by mining company and the customer simply needs to register and purchase mining contracts or shares.
Since cloud mining is provided as a service, there is generally some cost and this can result in lower returns for the miner.