Difference between intel Duel core and Core 2 Duo?

Hi ranchers,

I need to know difference between intel Duel core and Core 2 Duo..

If the system have Intel core 2 duo , then the system how works?

And also,

What are advantages of core i3, core i5, and core i7..

Please help me..
Thanks in advance.

There are several things to distinguish here.

The words "dual core" is a general term, which means that you have a processor with two processing cores.

Intel Core Duo is a specific processor architecture from Intel. Intel Core 2 Duo is another specific processor architecture from Intel, newer than Core Duo.

There are differences between the capabilities of Intel Core Duo and Core 2 Duo processors. One of them is that Core Duo processors are 32-bit only, while Core 2 Duo processors support 32-bit as well as 64-bit operating systems.

The Core i3, i5, i7 series of processors is what comes after the Core 2 Duo series. These processors have a newer architecture and are again faster than Core 2 Duo processors. There's also a second generation of Core i3, i5, and i7 processors (the ones that have product codes with four digits, starting with a 2, for example Core i5-2500, Core i7-2600, etc.).

It's a big jungle of product names and codes. If you want to understand all of it, the Wikipedia article is a good starting point.