While the development of the field in different jurisdictions has resulted in different specific meanings of what is meant by labour law, it is generally used in reference to employment contexts that involve a trade union, while the term employment law is usually used for workplaces where the legal relationship is directly between the employer and the employee. While in some jurisdictions the term may be used to refer to such law that may not involve trade unions, the genesis of the term is historically inseparable and begins with the labour union movements.