Online payment systems are digital platforms that allow users to make transactions over the internet. These systems enable individuals and businesses to send and receive money securely without the need for physical cash. Common examples include PayPal, Stripe, and Square, which facilitate payments for goods and services through websites and mobile apps. These systems typically require users to create an account and link it to a bank account or credit card. They use encryption and other security measures to protect sensitive information, ensuring that transactions are safe and reliable. Online payment systems have become essential for e-commerce and digital transactions.