Typically, an employment agreement exists between an employer and an employee, whether it is an oral or written contract. Employment terms can otherwise be found in awards or enterprise agreements.
Resignation is a termination of the employment agreement at the initiative of the employee. A resignation will be valid where there is an unequivocal intention by the employee to no longer be bound by the employment agreement. This is best effected in writing and with appropriate notice as required by the agreement or industrial instrument.