Return of service describes the written confirmation that a claim form, writ, summons or other court document has been properly served on a party. It is usually completed by the person effecting service (for example, a process server, solicitor, court officer or sheriff officer) and filed with the court as proof of service.In England and Wales and Northern Ireland, the concept appears in the Civil Procedure Rules and court forms (often as a certificate or statement of service). It records how, when, where and on whom documents were served, and by what method (personal service, post, document exchange or electronic service). Similar terminology and practice exist in Ireland under the Rules of the Superior Courts and Circuit Court Rules.In Scotland, the equivalent function is carried out by certificates or executions of service by sheriff officers or messengers-at-arms, although “return of service” may still be used descriptively.A valid return of service is critical for establishing that service requirements have been met, starting procedural time limits and avoiding challenges to jurisdiction, default judgment or enforcement.