a way to hide the amount sent in a Monero transaction
For more information, please read the creator Shen Noether's paper [here](https://eprint.iacr.org/2015/1098).
RingCT introduces an improved version of @ring-signatures called "A Multi-layered Linkable Spontaneous Anonymous Group signature", which allows for hidden amounts, origins and destinations of transactions with reasonable efficiency and verifiable, trustless coin generation.
["ringCT", "ring-CT"]
RingCT, short for Ring Confidential Transactions, is how transaction amounts are hidden in Monero.
Ring CT was implemented in block #1220516 in January 2017. After September 2017, this feature became mandatory for all transactions on the network.
The Basics