How do you recognize a visa card and masterCard credit card?

Visa and MasterCard credit cards can be recognized by their distinct logos and card numbers. Visa cards typically have a blue, gold, and white logo, while MasterCard features two overlapping circles in red and yellow. The card numbers also follow specific patterns: Visa numbers start with a '4' and have 16 digits, while MasterCard numbers start with '51' to '55' and also have 16 digits. Additionally, Visa cards usually have a slightly different design and color scheme compared to MasterCard.