Sometimes you will need to connect the second monitor to your machine.
If you are playing games, doing graphic design or video editing, we are recommending you to purchase an external graphic card with memory which is required by your applications. So, what is the difference between them? IGP is integrated into the motherboard, and PCIe is an external graphic card which can be installed in PCIe slot on your motherboard. There are two different graphic cards, IGP (Integrated Graphic Processor) and PCIe graphic card. HDMI is preferred because supports the bigger resolutions and provide transfer of audio signal. These days HDMI and Display ports are much more popular than VGA and DVI because VGA and DVI are old standards. You can find different ports on your graphic card including VGA, DVI, HDMI and Display port. What are output ports? Output ports provide a connection between computer or notebook and monitors.
Based on that, a number of monitors you can connect to your computer or notebook depend on the number of output ports on your graphic card. If your graphic card supports more output ports, you can connect more monitors. This does not mean that you need to buy another computer or notebook and use two monitors. For better user experience and better productivity, users are using two or more monitors.