What is Dual GPU Setup?

Could some explain to me what this is? I want to create a hackintosh on my 2nd ssd drive in my laptop. My laptop only have 1 graphic card 1070 max q. Do I have dual GPU set up or is this a single set up? Sorry Im new to this and was wondering if someone could clarify this for me. Thank you!

submitted by /u/ohmeowmeow8
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