A card reader is a device that allows users to access data stored on various types of cards, such as credit cards, debit cards, or memory cards. These devices can connect to computers or mobile devices, enabling the transfer of information. Card readers are commonly used in point-of-sale systems, ATMs, and for reading data from SD cards or microSD cards in cameras and smartphones. There are different types of card readers, including magnetic stripe readers, chip card readers, and contactless readers. Each type serves a specific purpose, such as reading the magnetic strip on a credit card or processing payments through NFC technology. Card readers enhance convenience and security in transactions and data management.