What does a card reader do?

Related questions

1. What is a microSD card reader?
2. What is a USB memory card reader?
3. What do I do if my SD card is not reading?
4. Do you need wifi to use the Square card reader?
5. How much do card readers cost?
6. Why is my phone not reading my SD card?
7. Where is the SD card reader on my computer?
8. How do I get my Mac to read my SD card?
9. Why do I need a memory card reader?
10. Are card readers free?

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