Wei refers to ether (ETH), the smallest unit of currency utilized on the Ethereum network. One ether equals 10 to the power 18 wei. One quintillionth of an ether is equal to one wei.
The smallest unit from which a user may complete a transaction is called a wei for ether. Wei for ether can be corresponded to what satoshi is for bitcoin.
The wei is named after Wei Dai, who is known for developing the Crypto++ library and for creating “b-money,” the forerunner of bitcoin.
