Drug trafficking describes the organised production, importation, exportation, supply or distribution of controlled drugs for financial or commercial gain, usually on a non‑personal-use scale. In legal practice it is an umbrella, non-technical term covering a range of statutory “drug trafficking offences” or “drug supply offences”. In England and Wales, Scotland and Northern Ireland, relevant conduct is mainly criminalised under the Misuse of Drugs Act 1971 (for example, supplying, offering to supply, possession with intent to supply, producing, importing or exporting controlled drugs). In Ireland, equivalent offences are principally contained in the Misuse of Drugs Acts 1977–2016 and related regulations. Across all four jurisdictions, aggravating features typically associated with drug trafficking include commercial quantities, involvement in organised crime, cross‑border activity, use of minors or exploitation of vulnerable persons, and the presence of weapons or violence. Drug trafficking is central to proceeds of crime, confiscation and sentencing practice, attracting severe custodial penalties and asset recovery measures. The term is widely used by courts, prosecutors and enforcement agencies in case law, charging decisions and evidential analyses, even where the precise offence charged is framed in narrower statutory language.