Child labor is work that harms children or keeps them from attending school. Around the world and in the U. S., growing gaps between rich and poor in recent decades have forced millions of young children out of school and into work. The International Labor Organization estimates that 215 million children between the ages of 5 and 17 currently work under conditions that are considered illegal, hazardous, or extremely exploitative. 
Child labor is making Children do work when they should be learning at School or relaxing and playing. Child labor happens a great deal in the Third World. Third world parents sometimes have the choice between letting their children work or letting their children starve. Child labor is involved in mining including Dirty gold and Blood diamonds.
When Child labor happens in the Developed world it's more likely child abuse but in bad economic conditions some parents even in developed nations put their children to work. In the USA children sometimes work long hours harvesting Tobacco and suffer nicotine poisoning. When they are light headed from nicotine children climb into rafters in barns where they can fall or children work near dangerous machinery.