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A card reader is a device that transfers information from a card to a computer or another system. Depending on the type, it can read data from credit cards, memory cards (like SD or CF), smart cards, ID cards, or even the old punched cards. The reader uses hardware components like sensors or magnetic heads to capture the data on the card and software to make it accessible for processing.

Types of Card Readers

Memory Card Readers: These are common for transferring data, like photos, from memory cards to computers.

Credit/Debit Card Readers: Found in point-of-sale (POS) terminals, these read the magnetic stripe or chip on financial cards.

Smart Card Readers: These read plastic cards with embedded microchips that store and process information for applications like financial transactions or access control.

Punched Card Readers: An older technology used for inputting data into tabulating equipment by detecting holes in cards.

NFC/RFID Readers: Used for contactless payments and other near-field communication applications.