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.
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.