Today,an employee who is not employed under a contract for a set duration or under a collective bargaining agreement is considered an at-will employee.

At-Will Employee

An employment arrangement where either the employer or the employee can terminate the employment relationship at any time and for any reason, except an illegal one.

Contract

A promise or set of promises for the breach of which the law gives a remedy or the performance of which the law in some way recognizes a duty.

Collective Bargaining

The process whereby workers organize collectively and bargain with employers regarding the workplace.