Your password should be a unique string of characters that only you know and should also be a non-dictionary term (random letters as opposed to the name of your pet). Because we put so much information on the Internet, a strong password is all but necessary.
But, for the lazy among us, we know that some folks will forgo common sense and use easy passwords that nearly anyone could guess. SplashData has put together its annual list of the most common passwords and unchanged from last year, the top password is, password.
The full list is posted below and more baffling is that there are systems that accept these common passwords. Best practice should be to force the user to create more secure strings of characters to reduce the chance that their account will be compromised.