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A Memory Stick is an IC (Integrated Circuit) which is stored in a compact and rugged plastic enclosure. Memory Sticks are designed to store data and to enable the transfer of data between devices equipped with Memory Stick slots.

The Memory Stick standard was introduced by Sony in October of 1998. Current Memory Stick capacities range up to 512MB. A Memory Stick is 50mm long, 21.5mm wide, and 2.8mm thick. An even more compact format, Memory Stick Duo, is 32mm long, 20mm wide, and 1.6mm thick. The theoretical transfer speed of Memory Stick is 160Mbps.