Definition - What does Dual Monitors mean?
In the context of personal computing, dual monitors are a visual display configuration consisting of two display devices, typically intended for workstations with extended workspace requirements. Most computer operating systems accommodate this type of configuration, which can be set up using various types of hardware connections (such as VGA and HDMI).
Techopedia explains Dual Monitors
There are a variety of advantages to dual-monitor configurations in personal computing. The added workspace that dual monitors provide is beneficial for projects that involve numerous simultaneously active applications (such as a web browser and word processor for research-heavy writing). Non-linear digital video editing often employs dual monitors, with one serving as a video display and the other as a project window. But dual monitors serve very simple personal computing habits as well.
There are a number of methods to connect the monitors with their computer, one of the most common of which (currently) being the HDMI cable. There are also many ways to configure the GUIs of both monitors, such as mirroring them (so that they each display identically) and enabling them to function as a continuous workspace (basically doubling the size of the original single GUI desktop).