MicroSD memory card
The mostly used memory cards in cell phones, digital cameras and most hand held electronics devices are the microSD memory cards. These are most popular because its small and thin design and higher storage capacity. microSD cards are available in capacities from 64 MB to 2 GB. Its small and thin structure is really very suitable for cell phones.
In the word microSD, micro is for small and thin structure and SD stands for Secure Digital. SanDisk created the microSD card, but at that time it was called as T-flash and Trans flash. After that SDA adopted that card and renamed as microSD card.