Mastercard
In short: Mastercard is a worldwide payment network and, alongside Visa, one of the largest card providers.
In more detail: The company emerged in 1966 from mergers of banks (at first “Master Charge”). As with Visa, banks issue the cards.
In Depth
Brands
Mastercard (credit/debit) and formerly Maestro for debit cards.
Technology and security
Chip and PIN, contactless via NFC, online payments with 3-D Secure. See Stripe, payment terminal.