What Is Dual Core Processor? Which Technology Is Use In Dual Core Processor?

Dual core processor is only a processor which is installed in PC but it functions like a 2 processor that why is known a Dual Core processor when we see processor performances in task manager when then it shows 2 processor running .In that hyper threading technology is used for multi-casting when we several applications & files at a time then it do multi-casting in all files which are running because of these the applications will run fast & it saves very fast.