There are:
CRT monitors (those fat monitors)
and
LCD monitors (flat screens)
Near Field Monitors
Monitors typically use VGA or DVI now-a-days.
There are many different types of monitors that LG manufactures. One type is the touch screen monitor, which is very popular. They also have many LCD monitors.
Touch-screen monitors.
there are four : LCD HD Analog and Tube
DVI
All monitors will work with Macs. If it is an older monitor requiring the screw-in type connector, you need to buy a USB thing for it. Otherwise, there should be a port in the back of the Mac for the plug-in type.
A video splitter type cable will allow you to view 2 monitors.
The Event Monitors are medical devices that record the heart's electrical activity and record the heartbeats only when symptoms of the heart problem occur.
Computer monitors typically consume around 30-60 watts of electricity, depending on the size and type of the monitor.
Interlaced monitors.
If you have two 19" LCD monitors buy dual mount monitor back, this will will give your display setup a professional look.