DReps
Delegated Representatives (DReps) are ADA holders who registered On-Chain to allow other members of the community to delegate their voting power to them, so that they can vote on their behalf. They are are like 'parlimentary representatives' in the Governance system.
Any ADA holder can become a DRep. They simply need to register on GovTool (or other platform). How to become a DRep
DReps are defined by CIP-1694. They can:
Submit Governance Actions
Review and submit votes on active Governance Actions
Accept delegated Voting Power from any ADA holder
When a DRep votes on a Governance Action, they vote with all the Voting Power that is delegated to them.