What is SSE

Gonna be blunt, what is SSE, I looked for it on webopedia couldn't find it, and I did a search on the forums and I also couldn't find it, lots of threads talked about it but none really say what it is. All I know is that it is a instruction set and that is it. Also if anyone cares to explain 3dnow I'm not gonna stop you.

SSE is an acronym for "Streaming SIMD Extensions". It's an Intel-sponsored extension to the x86 instruction set. SSE is like 3dNow! which is like MMX -- both are designed to aid multimedia operations by executing the same instruction on multiple data simultaneously. SIMD (Same Instruction Multiple Data) is, in effect, a drill sergeant. Sarge screames "Platoon! About...FACE!" and the entire platoon about-faces, instead of the already-irritable sergeant marching down the line and issuing the instruction to each soldier.

Sweet thanks, makes much more sense now.