A monitor is the box that you look at to see what your computer is doing! A monitor connects to the system unit usually by a cable connecting to a graphics port. The graphics port is these days usually on your motherboard but you can also buy graphics cards that fit into a designated graphics slot on your motherboard called AGP or with the newer PCs PCI express.
With newer graphics cards you can connect 2 monitors to your computer. There are 2 main types of monitors namely CRT(cathode ray tube) and LCD(liquid crystal display).LCD monitors are more common today as they are thinner and are better for your eyes but you still see a lot of people still using CRT because of the expensive cost of LCD monitors!
Computer screens rang from many different sizes, commonly they range from 15”-24” in size. If you would like to find out more about monitors, how they work and other information please go to: http://en.wikipedia.org/wiki/Computer_display
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