DGX tokens is the core product at DigixGlobal. Each DGX token represents 1 gram of gold. They represent gold bars that have gone through our Proof of Asset (PoA) protocol such that they can be proven to exist on the Ethereum Blockchain. More information about this protocol can be found in our whitepaper. DGX tokens can be recasted into gold bars and redeemed from DigixGlobal.
DGD tokens are being offered at the DigixDAO (DAO = Decentralized Autonomous Organisation) crowdsale. DigixDAO is a software protocol fully on chain, fully decentralized and autonomous, created by DigixGlobal for decentralized governance.