Labour law
The basic feature of labour law in almost every country is that the rights and obligations of the worker and the employer are set by a contract of employment between the two. In most countries, employers must give their workers a written contract. There may be a  minimum wage. There may be rules about how many hours a day people can work, about their rights to holidays and to sick pay. There are often rules about safety at work. There may be laws about treating people fairly and not discriminating.