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External memory cards are small, portable storage devices that can be inserted into various electronic devices such as cameras, smartphones, tablets, and computers to expand their storage capacity. These cards are typically used to store photos, videos, music, and other digital files, allowing users to easily transfer and access data on different devices. External memory cards come in various formats and storage capacities, with popular types including SD cards, microSD cards, and CompactFlash cards. These cards are essential for individuals who require extra storage space for their electronic devices.