A dual monitor is useful in cases where you need to open several applications or more than one file at the same time. You do not have, for example, to vertically split the screen to squeeze two open Office files.

Video and picture editing, gaming, tweet on one screen and read a book on the other, compare similar products, use two browsers, run two different Operating systems, are other examples where dual monitors come into rescue.

Do Web research and explain, step-by-step below how you can connect a second monitor to your system. Be as detailed as possible. Make sure you state what additional hardware/software you will need, other than a PC and a second monitor, if any, to connect two monitors.