difference between user passcaode and administrator passode?

Answer 1

The administrator pass code gives access to all the rights and demands of the system, including adding users, allocating user rights, and kicking users off. Usually the administrator can change passwords on/for a user.
Because there are parts of a system that should not be changed by users for their convenience or be resources that should be shared instead of being hogged, users are given restricted access, which they use their log in name and password to get use of the computer.
In systems where multiple terminals allow multiple users on at the same time, the password/user software protects each user from the others, both for programs running wild and for users who are vandals. For systems where several people might use a single computer, such a data entry person there every day and an CPA who comes in once a week or a family computer where kids use it variously and dad or mom uses it when the kids are in school or later at night, the user passwords and software, divide up the computers storage to prevent users from accessing what they should not.
The administrator can get at anything.