"At-will employment is a doctrine of American law that defines an employment relationship in which either party can break the relationship with no liability, provided there was no express contract for a definite term governing the employment relationship and that the employer does not belong to a collective bargain (i.e. a union)."
This is the default employment relationship in the US. Most states, in particular California, have implied contract or good faith exceptions to this, where an employee has more protection, but the law is different in every state, and if you do not have an explicit contract, you should probably operate under the assumption that your company can terminate you at any time, without cause.
"At-will employment is a doctrine of American law that defines an employment relationship in which either party can break the relationship with no liability, provided there was no express contract for a definite term governing the employment relationship and that the employer does not belong to a collective bargain (i.e. a union)."
This is the default employment relationship in the US. Most states, in particular California, have implied contract or good faith exceptions to this, where an employee has more protection, but the law is different in every state, and if you do not have an explicit contract, you should probably operate under the assumption that your company can terminate you at any time, without cause.