Corsair Obsidian Series 650D HELP

[army1506]

Hello,
I am thinking about buying this case from newegg. I am new to building computers, and actually watched the newegg tv video on youtube on how to build a computer. He used this case in the video. At one part, he talks about the molex case cable. Hes not very clear. I would like to know what the molex case cable is for, what plugs into it, and what it does. Also, will i need an adapter to plug it into my power supply?

 

[Someone Somewhere]

Power supplies come with Molex connectors as part of the bundle of cables. They look like this:

They are a general source of power for whatever needs it. My guess is a fan, though it could be a light or something.