Passwords are simpler and cheaper than other, more secure forms of authentication like special key cards, fingerprint ID machines, and retinal scanners. They provide a simple, direct means of protecting a system or account. For the sake of this article, we'll define a "password" as a word, a phrase, or combination of miscellaneous characters that authenticates the identity of the user. Passwords are generally used in combination with some form of identification, such as a username, account number, or e-mail address. While a username establishes the identity of the user for the computer or system, the password, which is known only to the authorized user, authenticates that the user is who he or she claims to be. This means that their function is to "prove to the system that you are who you say you are" (Russell).
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