Memory card is a flash memory data storage device used for storing digital information. They are commonly used in many electronic devices, including digital cameras, mobile phones, laptop computers, MP3 players, and video game consoles. They are small, re-recordable, and able to retain data without power.
There are several different kinds of memory cards: TransFlash (Micro SD, MMC Mobile), Mini SD, MMC, RS-MMC, and Secure Digital cards (SD card). Different cell phones are compatible with different memory cards. Sometimes you need a memory card reader to transfer your pictures and files to your PC through a USB port.