Most computer systems use passwords to allow users to prove who they are. The password is a secret word or phrase that is only known by the 'real' owner of the computer account. If somebody else knows (is told, finds out, or guesses) the password for an account, he or she can use that computer account as if they are the real owner. This means that they can read email message and the contents of computer files, or delete or modify message and files. You should never tell other people what your password is.
Back to the Security Guidance page.