About DAI, it is a decentralized stablecoin backed by the dollar, kept stable by smart contracts on the Ethereum blockchain. Unlike others, DAI is not controlled by a single company, but rather by a system called MakerDAO, which uses collateral such as Ethereum to ensure its value. It is popular for being less centralized and for offering more transparency, although it still faces debates about the risks and volatility of the collateral.
A great option compared to others, as it is a stablecoin. It is worth diversifying and following trends, remembering to track the $ETH as cause/effect.