Your computer password is your personal key to a computer system.
Passwords help to ensure that only authorized individuals access computer systems.
Passwords also help to determine accountability for all transactions and other changes made to system resources, including data. If you share your password with a colleague or friend, you may be giving an unauthorized individual access to the system. Authentication of individuals as valid users, via the input of a valid password is required to access any shared automated information system. Each user is accountable for the selection, confidentiality and changing of passwords required for authentication purposes. Since you are responsible for picking your own password, it is important to be able to tell the difference between a good password and a bad one.