A card reader is a device that allows users to read data from various types of cards, such as credit cards, debit cards, and identification cards. These devices can connect to computers, smartphones, or point-of-sale systems, enabling secure transactions and data access. Card readers often use technologies like magnetic stripe, chip, or contactless NFC to process information. Many businesses use card readers to facilitate payments and improve customer service. They help streamline transactions by quickly capturing card information, reducing the time spent at checkout. Popular brands of card readers include Square, PayPal Here, and Verifone, which cater to different business needs.