Micro SD Cards are the newest and smallest flash memory secure digital cards available, much smaller than both standard SD memory cards and even MiniSD memory cards.  MicroSD cards created to be used with mobile phones; however other applications such as GPS receivers, digital cameras and Mp3 players do exist.

The Micro SD Card is extremely small, only about one-fourth of the size of a standard SD memory card. It can be considered the size of a human fingernail.  The MicroSD Card is currently the smallest compact flash memory card on the market commercially. It was originally developed as the T-Flash (sometimes called TransFlash). It was announced in March of 2005 and was made available commercially a year later in 2006.