Who is a user?

A user is a the person who uses the computer and will have a user account
there are 2 types of user account

Local User And domain user

a local user is an account created on the computer

where as a domain user is created on a Domain controller ( Server Machine) that user account can then log on to any computer within the Domain which that user has access to if it has been set up all there desktop setting documents will follow them around to each computer they log in to