What does SSE4 or SSE3 mean?

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Hello everyone
Anyway I was wondering what SSE# means? When ever I look at the specs on a cpu it will say that the cpu supports SSE4 or SSE(insert # here).
So what does SSE stand for and what purpose does it serve? In what way does SSE affect how a cpu performs?
 
Supplemental Streaming SIMD Extension

SSE3 contains 13 new instructions over SSE2.
SSE4 contains 47 new instructions over SSE3

It's all jibberish stuff
 
Thanks for the reply man.
I attempted to understand what the article was talking about to little or no avail lol. Little beyond me I guess
 
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