"Trafficking in persons" shall mean the recruitment, transportation, transfer, harbouring or receipt of persons, by means of the threat or use of force or other forms of coercion, of abduction, of fraud, of deception, of the abuse of power or of a position of vulnerability or of the giving or receiving of payments or benefits to achieve the consent of a person having control over another person, for the purpose of exploitation. Exploitation shall include, at a minimum, the exploitation of the prostitution of others or other forms of sexual exploitation, forced labour or services, slavery or practices similar to slavery, servitude or the removal of organs.

Trafficking invariably involves forcible movement of a person from one place to another and forcible utilization of their services with the intention of inducting them into trade for commercial gains. When we say 'forcible', it signifies that the action is against the person's will or that consensus has been obtained by making deceptive claims and false allurements. In some cases, consensus is obtained because of the victim's social conditioning, where the victim is not even aware that s/he is being exploited.
Source. www.ungift.org

"Some 2.5 million people throughout the world are at any given time recruited, entrapped, transported and exploited-a process called human trafficking-according to estimates of international experts." UNODC perspectives publication (2008)

"Globally, an estimated 1.2 million children are trafficked each year, within countries as well as across borders," said UNICEF Executive Director Ann M. Veneman (2007)

At any one time across the world, around 1.8 million children are being abused through prostitution, child pornography and sex tourism. In the UK there are 5,000 child prostitutes. 75% of them are girls, reported by Save the Children (2007)