MicroSD (micro SD) cards were originally called T-Flash and then TransFlash before being rechristened as microSD when adopted by the SD Card Association (SDA). Like its name, the microSD card/ TransFlash is essentially an SD card, but in a smaller package (the size of a fingernail). It is one of the smallest removable flash memory card formats designed specifically for mobile phones and other small devices. Like any flash memory card, it can be used to store various types of files, including photos, videos, music, or software.
Common Uses of MicroSD cards:
Mobile phones, handheld GPS devices, portable audio players, flashcards for Nintendo DS emulation, and expandable USB flash memory drives. MicroSD cards can be used in SD-compatible devices via an adapter.
Find out what type of Memory Card you need by Phones here (PDF File)
