Ecash 【Electronic cash】
Electronic cash or e-cash is a system use to transfer money in electronic medium. There are several popular e-cash providers such as PayPal, WebMoney, etc.
Electronic cash is like regular cash, has value immediately and aim to be secure and untraceable although there can be problems with security using e-cash. Electronic cash exchanged money outside established networks of banks and it is a payment mechanism designed for the Internet.