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Multi-monitor is a term used to refer to the usage of multiple displays, like monitors, projector, televisions, with the main purpose of expanding the surface available for programs on a PC.
The term is synonym with dual-monitor or multi-screen. Multiple monitors connected to the same PC help the users to improve their productivity while working or playing on a computer. This happens because you can see multiple applications in the same time, or compare documents side-by-side. This is very useful in graphic design, architecture, engineering, and video editing.