A central bank digital currency is money issued directly by a central bank in digital form – a claim on the central bank rather than on a commercial one. Most of the world’s major economies have projects underway at some stage.
Why governments want them
Payment systems currently run through private intermediaries, which means the central bank has limited visibility and no direct channel to the public. A digital currency changes both.
The stated motivations are efficiency, financial inclusion, and reducing dependence on private payment networks. The unstated one is that stablecoins started providing a digital dollar that no central bank controls, and that got attention.
The design questions that matter
Whether it is account-based or token-based determines whether transactions are inherently identifiable.
Whether balances earn interest determines whether people move deposits out of commercial banks, which would be destabilising in a crisis.
Whether there are holding limits, and whether transactions can be restricted by rule – which is where the privacy debate actually lives.
The privacy problem
Cash is anonymous. Card payments are not, but the record sits with a private company under privacy law.
A digital currency could be either. The technical capability to make every transaction visible to the state exists, and whether it is used is a policy decision rather than a technical one. Several designs propose tiered privacy – small transactions anonymous, large ones not.
That is the debate worth following, and it is being conducted mostly among specialists.
Where it stands
Several countries have live systems with modest adoption. Most are in pilots. The gap between launching one and people using it has been larger than expected everywhere, because existing payment methods already work.