International conventions define a child as anyone under 18, but countries may have other definitions. There is no universal definition of child labor, but most agree it harms children's well-being or blocks their education. Factors that contribute to child labor include poverty, traditions, lack of access to schools, market demand, income shocks, and weak laws. Child labor deprives children of education and jeopardizes their health, development and safety. Many work in hazardous conditions and face injury or death.