RingCT stands for "Ring Confidential Transactions," a privacy feature used in the Monero cryptocurrency. It enhances transaction confidentiality by obscuring the amounts being transferred, making it difficult for outside observers to determine the transaction details. In RingCT, each transaction is bundled with a group of decoy transactions, which helps to hide the true sender and receiver. This method ensures that only the involved parties can see the transaction amounts, while others cannot trace or link transactions, thereby improving user privacy and security in the Monero network.