SD Micro 16GB is a memory card which comes in many varieties and which you can buy at any electronic shop. These cards are used in various devices like digital cameras, media players, cell phones, audio players, USB flash memory drives. It is very tiny in size that is why these are found in different mobile phones, cameras and other gadgets. Many companies these days are manufacturing micro sd cards which were originally invented by SanDisk. The Internet offers many sources where you can buy micro sd memory cards. It is necessary to ascertain whether or not the card you are buying will be supported by your electronic gadget. Some gadgets are manufactured in such a way that they are compatible with particular types of micro sd cards. MicroSD cards have succeeded in replacing the older MiniSD cards, and are in fact being used by mobile phone companies.