What does modern slavery look like?

More than 45 million people are living in modern slavery, with Asia accounting for two thirds of the victims, a new report says.
The 2016 Global Slavery Index, from the Walk Free Foundation in Australia, defines slavery as "situations of exploitation that a person cannot refuse or leave because of threats, violence, coercion, abuse of power or deception".
 Modern forms of slavery can include debt bondage, where a person is forced to work for free to pay off a debt, child slavery, forced marriage, domestic servitude and forced labour, where victims are made to work through violence and intimidation.
 The BBC looks at five examples of modern slavery.