E-money refers to stored-value or prepaid payment instruments that allow users to conduct financial transactions in electronic form. There are several types of e-money including centralized systems run by companies like PayPal, decentralized systems like Bitcoin that use blockchain technology, mobile e-wallets, and offline anonymous e-cash. While e-money provides benefits like convenience, security, and lower costs compared to physical currency, it also presents risks like fraud that need to be addressed through technology and regulation. Overall e-money is poised to greatly expand digital financial inclusion if these challenges can be overcome.