Here are a few links that will lead you to more than you ever wanted to know:
ARRL Web Page on Grid Squares
People express themselves using a language that has many words. Computers use a simple language that consists of only 1s and 0s, with a 1 meaning "on" and a 0 meaning "off." Trying to talk to a computer in its own language would be like trying to talk to your friends by using Morse code—it can be done, but why would you?Unbelievable! I plan to send Microsoft a note about this. Surely if those people on TV who say "make my computer so it doesn't crash" can get an entire new version of Windows created just for them Microsoft will move quickly to correct this horrible statement.