What is the difference between Memory stick and SD Memory card?

A memory stick is Sony's brand of memory cards. Up to recently all of Sony's cameras used Memory Stick exclusively. Now the high end Sony Cameras also use the Compact Flash cards too. The Secure Digital cards were invented by Panasonic and non-sony cameras use them. So your Sony camera will NOT be able to use a Secure Digital card.

Memory Stick is a removable flash memory card format, launched by Sony in October 1998 [1], and is also used in general to describe the whole family of Memory Sticks. In addition to the original Memory Stick, this family includes the Memory Stick PRO, a revision that allows greater maximum storage capacity and faster file transfer speeds; Memory Stick Duo, a small-form-factor version of the Memory Stick (including the PRO Duo); and the even smaller Memory Stick Micro (M2). In December 2006 Sony added the Memory Stick PRO-HG, a high speed variant of the PRO, to be used for high definition still and video cameras. Secure Digital (SD) is a flash (non-volatile) memory card format developed by Matsushita, SanDisk, and Toshiba for use in portable devices. Today it is widely used in digital cameras, handheld computers, PDAs, mobile phones and GPS receivers, and video game consoles. SD card capacities range from 8 MB to 4 GB and from 4 GB to 32 GB for SDHC cards as of 2008. no,sd card cannot be used in sony handycam..use memory stick dio/pro only..

No big difference, Sony call them memory stick , rest of them call it as memory card

memory stick is one which is used on a touch screen monitor whereas memory sd card is one which is used to store some memory in ur device