What is Hyper Threading?
http://lmgtfy.com/?q=what+is+hyperthreading
It's a technology which allows the CPU to utilize its cores twice by fooling the OS into thinking it has twice as many cores. Like i7 chips have 4 cores and 8 threads so in windows you can see it as an 8 core processor, same thing with i3 2 cores + 4 threads appears as a quad core. hope that clears it up for you.