A password is a secret word or string of characters that is used for authentication, to
prove identity or gain access to a resource (Example: An access code is a type of
password). The password must be kept secret from those not allowed access.
The use of passwords is known to be ancient. Sentries would challenge those wishing to
enter an area or approaching it to supply a password or watchword. Sentries would only
allow a person or group to pass if they knew the password. In modern times, user names
and passwords are commonly used by people during a log in process that controls access
to protected computer operating systems, mobile phones, cable TV decoders, automated
teller machines (ATMs), etc. A typical computer user may require passwords for many
purposes: logging in to computer accounts, retrieving e-mail from servers, accessing
programs, databases, networks, web sites, and even reading the morning newspaper
online.
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