Actually, it's quite complicated in theory but in reality it just means how readable the screen is.
Some folks like big font, some like small, etc.
Screen resolution is measured in AL's (Arm Length - from your face to the screen) - the bigger the number of AL's, the harder the screen is to read. Things also get hard to read if your AL goes below a factor of one.
Hope that helped! :)
Don't they measure political alliances in AL's?
It helps plenty thanks. My resolution must be below one. I can hardly see it. I have to keep hitting view and increasing my text size. That's really starting to annoy me. Everytime I click on an article, I have to enlarge it.