What is the best method to connect two monitors to your computer if your display card with the sole purpose have one output?

i want the displays to be independent of respectively other, ie i can drag one window from one monitor onto the other. i do not want them to show an indentical display. kinda approaching when you connect another monitor to a laptop and you have two screen to work with, except beside a desktop.

Answer:
You will need to install a dual person in charge graphics (video) card.

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