What does this mean?

Solution
Yes! Those are places on the motherboard (inside the case) that gives connection to the USB slots on the outside of your case.

When you get the motherboard you'll want to take a good look at the manual, they go into great detail about where to plug-in each of your connections.

Edit: There will be several special cables going from your case directly into your motherboard. These will include the USB cables, your power button cable, your 'reset' cable, and often a couple more such as the 'processing' light that blinks when the PC is thinking.
Hi xboy,

Rear Panel Ports are the places on the back of the PC where you plug in devices like your mouse, monitor, and keyboard. You'll see things here like ethernet ports, HDMI/ DMI/ VGA ports for video, USB ports, etc.

Internal I/O Connectors are the places directly on the motherboard (inside the case) that you plug in things like your CPU, graphics cards, fans, and power connectors.
 
Pretty much what glamdringfh stated.

The internal I/o connectors would also include the places you attach the cables from your case (power/reset/headphone jack etc). If your case has USB 3.0, make sure you have a USB 3.0 header on the board to attach that cable to.
 
are you installing that mobo? its pretty straight fordward. Internal I/O Connectors are connect devices such as DVD drive, USB etc etc.
and Rear Panel Ports is the place where you going to hook up your devices after the PC is build. Mouse, Keyboard, Ethernet Cable etc etc.
 

Ok but it says USB connectors do I plug those into a case I would buy?
 
Yes! Those are places on the motherboard (inside the case) that gives connection to the USB slots on the outside of your case.

When you get the motherboard you'll want to take a good look at the manual, they go into great detail about where to plug-in each of your connections.

Edit: There will be several special cables going from your case directly into your motherboard. These will include the USB cables, your power button cable, your 'reset' cable, and often a couple more such as the 'processing' light that blinks when the PC is thinking.
 
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