PayPal Holdings Inc. trading as PayPal, is an American company operating a worldwide online payments system that supports online money transfers and serves as an electronic alternative to traditional paper methods like checks and money orders. The company operates as a payment processor for online vendors, auction sites, and many other commercial users, for which it charges a fee in exchange for benefits such as one-click transactions and password memory. PayPal's payment system, also called PayPal, is considered a type of payment rail.