Visa
In short: Visa is a worldwide payment network for credit and debit cards.
In more detail: Visa itself does not issue cards. Banks and payment providers issue them; Visa operates the network that forwards and settles payments.
In Depth
History
Developed from BankAmericard (1958), named Visa since 1976.
Card types
Credit card, debit card, prepaid. Contactless via NFC. Competitor: Mastercard. See payment terminal, Stripe.
See also: Mastercard, Maestro, NFC, Payment Terminal