I got a sony T7 digital camera. What type of memory card can i buy for it?

Whats the difference between memory stick pro and duo pro

A memory stick pro duo is a half size (physically not storage space) version of the memory stick pro. The memory stick pro will not fit your camera, it is too long. "Pro" cards have faster read/write speeds but are usually more expensive. Sandisk also sell memory stick pro duo's and are cheaper than sony cards.