Child labour refers to the employment of children at regular and sustained labour. This practice is considered exploitative by many international organizations and is illegal in many countries. Child labour was employed to varying extents through most of history, but entered public dispute with the advent of universal schooling, with changes in working conditions during the industrial revolution, and with the emergence of the concepts of workers' and children's rights.

In many developed countries, it is considered inappropriate or exploitative if a child below a certain age works (excluding household chores, in a family shop, or school-related work). An employer is usually not permitted to hire a child below a certain minimum age. This minimum age depends on the country and the type of work involved. States ratifying the Minimum Age Convention adopted by the International Labor Organization in 1973, have adopted minimum ages varying from 14 to 16. Child labor laws in the United States set the minimum age to work in an establishment without restrictions and without parents' consent at age 16, except for the agricultural industry where children as young as 12 years of age can work in the fields for an unlimited number of non-school hours. See Children's Act for Responsible Employment (CARE Act).