Caps lock is a feature
keyboards have that, when active, capitalizes each letter typed
on the keyboard. Unlike most keys on the keyboard, the caps lock key
is a "toggle key," which is always in either an on or off position.
When off, the letters typed are input like usual. When on, each
letter typed is transmitted as an upper-case
Caps lock does not alter the input from the rest of the keys, such
as numbers and symbols.
Because caps lock changes the input of the letters on the keyboard,
it is important to know whether it is on or off. Therefore, most
keyboards have a light on the caps lock key that turns on when
active, indicating caps lock is on. Because passwords are often
case-sensitive, it is smart to make sure caps lock is not active
when entering login information. Also, it is best not to use caps
lock when typing e-mails because IT MAKES IT SEEM LIKE YOU ARE
YELLING when you type in all caps.