User account
A collection of information that tells Windows which user rights and access permissions a person has on a computer. The user account records the user name, password, and a unique number that identifies that account.
Administrator account
A type of user account that allows complete access to the computer. Administrators can make any desired changes. This account type is not recommended for daily use, and should only be used when necessary.
Password
A secret string of characters that lets users log on to a computer and access files, programs, and other resources. Passwords help ensure that unauthorized users do not access the computer.
Domain
A collection of computers on a network that share a common database and security policy. A domain is administered as a unit with common rules and procedures, and each domain has a unique name.