Human trafficking refers in practice to the recruitment, transportation, transfer, harbouring or receipt of persons through coercion, deception, abuse of vulnerability or other improper means for the purpose of exploitation, such as sexual exploitation, forced labour, slavery‑like practices, criminal exploitation or organ removal. In England and Wales, Scotland and Northern Ireland, it is principally addressed under the Modern Slavery Act 2015 (and earlier offences such as trafficking for sexual exploitation), while in Ireland it is criminalised under the Criminal Law (Human Trafficking) Acts 2008–2013. The concept is aligned with international instruments, notably the Palermo Protocol and the Council of Europe Convention on Action against Trafficking in Human Beings. Key legal features include: an act (recruitment etc.), means (force, threats, deception, abuse of power or vulnerability) and exploitative purpose. For child victims, the “means” element is not required. Human trafficking is central to prosecutions, confiscation and restraint proceedings, victim identification, non‑punishment of trafficked persons for compelled offending, immigration and asylum claims, compensation, and safeguarding duties. Usage and core elements are broadly consistent across the UK and Ireland, though statutory drafting and offence labelling differ.