Memory Stick, Memory Cards
The Memory Stick family includes the following: Memory Stick PRO (MS Pro), Memory Stick Pro Duo (MS Pro Duo) and the Memory Stick Micro(M2) memory card
MS PRO is predominantly used in Digital Cameras and is gradually being phased out and replaced by MS Pro Duo memory cards are more common these days and used in many of the Sony Camera's, Mobile phones and gaming devices such as the Sony PSP.
Memory Stick Micro or more commonly known as the M2 memory card is the latest in the family and is used primarly in mobile phones