In India, Fire works, matches, printing press, mechanical sheds, hotels, even beg... Dunno about other countries... Child labour are treated like slaves and paid little...
Children working under 14 years are child labour... Child labour is mainly due to poverty.
Recently, Apple has been reported using child labour. Nike and Gap are two companies commonly known for their use of child labour. Disney has also been said to use children in Haiti to stitch clothes and toys. Other companies include:
Old Navy (the clothing store)
Levi Strauss (the clothing store)
Mattel (commonly known for producing Barbies)
Coca-Cola (in their sugar-cane fields)