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memory card - Computer Definition
(1) A user-replaceable module in a computer that holds RAM chips. "Memory card" mostly refers to flash chips in definition #2 below. See memory module.
(2) A removable module that contains non-volatile flash memory chips used for storage in digital cameras and mobile devices. The major card types are SD Cards, Memory Sticks and CompactFlash; the SD Card family being the most popular. See flash memory, memory card reader, SD Card, Memory Stick and CompactFlash.