What does Hyperthreading do ???

[Lycaone]

Hi there, i'd like to know what does Hyperthreading do... ?
I know that it virtualises double the core count of the actual physical cores, but is it all there is to it .... ???

THANKS

 

[getochkn]

http://lmgtfy.com/?q=What+does+Hyperthreading+do

Google can answer this for you and since there is like 10,000,000 pages about it, seems a waste for someone to type it out again.