Prosecution is the process of instituting and conducting criminal proceedings against a suspect or accused, from charging through trial to sentence. It includes making charging decisions, drafting a charge or indictment, managing the case, fulfilling disclosure duties, presenting evidence, and making submissions on conviction and sentence. The term is descriptive rather than defined in a single statute, but its core meaning is established across UK and Irish criminal practice: the prosecution bears the burden of proving guilt beyond reasonable doubt and owes duties of fairness and disclosure.In England and Wales, prosecutions are usually conducted by the Crown Prosecution Service (CPS); other prosecutors include the Serious Fraud Office, HMRC and local authorities. The CPS applies the evidential and public interest tests in the Code for Crown Prosecutors. Private prosecutions are permitted (Prosecution of Offences Act 1985, s.6), subject to the DPP’s power to take over and discontinue.In Scotland, prosecutions are brought in the name of the Lord Advocate by the Crown Office and Procurator Fiscal Service; private prosecutions are exceptional and require High Court authority (bill of criminal letters).In Northern Ireland, the Public Prosecution Service applies similar evidential and public interest tests. In Ireland, prosecutions are conducted by the Director of Public Prosecutions, with Gardaí prosecuting many summary offences.