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A use case model is a logical model.

Each actor on a use case diagram represents a role

A role is a set of related activities executed by one or more people in the organzation. A role is not a specific user, although in some organizations a single person may execute a function leading you to believe that the function is user specific. This is simply a case of a role that is only executed by a single person.

A use case essentially outlines a process, for example withdraw money is a use case that exists for an ATM. Withdraw money is execucted by the role customer. Withdraw money can be executed many times.

Both actors and use cases are abstract and therefore are not physical models.

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