SEOUL, Dec 15 (Reuters) - South Korea's central bank governor said on Friday introducing a central bank digital currency (CBDC) is now an urgent task for central banks.

Rhee Chang-yong, governor of the Bank of Korea, said at a conference in Seoul on digital currencies that stablecoins raise concerns about financial stability and pose challenges to central banking operations.

Stablecoins are a form of cryptocurrency backed by an asset or fiat currency. They have surged in popularity but their weaknesses were highlighted last year by the spectacular collapse of TerraUSD and its sister coin Luna. (Reporting by Jihoon Lee Editing by Ed Davies)