PayPal is an international e-commerce business allowing payments and money transfers to be made through the Internet.

PayPal is an acquirer, performing payment processing for online vendors, auction sites, and other commercial users, for which it charges a fee. The fee depends on what currency or payments the seller is using. In addition, eBay purchases made by credit card through PayPal may incur extra fees if the buyer and seller use different currencies.

PayPal became the payment method used by a majority of eBay users.