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But slavery is  - the modern day estimate for the number of men, women and children . Today's global slave trade is so lucrative that it nets traffickers more than each year.

Slavery affects children as well as adults

Debt bondage often ensnares both children and adults. In Haiti, for example, many children are sent to work by their families as domestic servants under what's known as the  - the term comes from the French language rester avec, "to stay with".

These children, numbering as many as , are often denied an education, forced to work up to 14 hours a day and are sometimes victims of sexual abuse.

Slavery is not always race based

Then, as now, race is not always the main reason for enslaving someone. In the past, those who were living in poverty, who did not have the protection of kinship networks, those displaced by famine, drought or war were often caught up in slavery.

In the UK, , , and have all been found to have people working in slavery. Victims of human trafficking come from and all walks of life. There isn't just one type of modern day slavery, it takes many forms.

Your gadgets could be to blame

The demand for certain types of goods has propelled slavery's numbers. In the past, the desire for sugar drove the growth in slavery. Now, the has exacerbated slavery in the coltan mines of the Democratic Republic of Congo. Many slaves or trafficked victims are often exploited in mining for gold, coltan, molybdenum, niobium, tin - which can be used in .

Ordinary people can use their power as consumers to combat modern slavery

, 5,000 to 6,000 young children work in the coltan mining industry, surrounded by armed guards to prevent their escape. Much of the profit from this trade goes to in Central Africa.

Traditional slavery still exists

Chattel slavery (where one person is the property of another) is illegal but still exists especially in the  - where abolitionists' efforts to stamp out the practice have been in vain.

The organisation says that today at least are the property of others, while up to 600,000 men, women and children are in a bonded labour situation - up to 20 percent of the population.

India has the most number of slaves, globally

India has the , with estimates ranging from 14 million to 18 million people. In India many people work as slave labour , this includes women and children.

Now, as in the past, . Historically, some experienced such severe poverty that they had no choice but to sell themselves to be bound to another person. And similar cases still happen around the world today.

It involves global movement

Long distance movement is common in slavery of the past and the present. For West Africans in the pre-modern era, the journey across the Atlantic must have been unimaginable.

Today, labourers move around the world freely looking for work, but some end up caught in slavery-like situations. They are promised a good job with decent conditions and wages, but instead are trapped in a cycle of debt and despair, where they are bound to their employer with no chance of escape.

Many of the workers constructing the stadia for the Qatar World Cup in 2022 come from South Asia. these workers often have their meagre wages docked unjustly, their passports seized and are forced to work in life-threatening conditions.

Slave soldiers fight in wars

One similarity between historic and modern slavery is the use of enslaved labour, especially children, in armies.

In recent years, have been abducted and forced to labour in the led by Joseph Kony, in Northern Uganda.

Over four centuries ago, Christian children were valued as soldiers in the army of the Ottoman Empire. The children were taken from their homes, forced to convert to Islam and in the military.

Slavery was never abolished

Today, an active abolition movement still exists. It applies lessons from the earlier abolition movement that ended the transatlantic slave trade, which recognised the importance of victim stories as a powerful tool to raise awareness.

	Newly released child soldiers stand with rifles during their release ceremony in Yambio, South Sudan, on February 7, 2018 [AFP]

Just as Africans such as became part of the abolition movement in 18th century London when they talked about their lives as slaves, so today, the benefit of encouraging survivors to share their .

In the 1790s, to persuade the British government to end slavery in the British Empire, women abolitionists organised that had been produced using slave labour and instead bought "fair trade" produce. Similarly, today, manufacturers and growers recognise that guaranteeing a product as fair trade - and free from slavery - will help their goods sell.

Slavery still exists in many forms today, and the impacts it has on millions of people are no less devastating than they were in the past.

Yet ordinary people can use their power as consumers to combat modern slavery, simply by paying attention to what they buy, and raising awareness among their friends, family and colleagues.

Catherine Armstrong is a lecturer in American History at Loughborough University.