A detective is an investigator, either a member of a police agency or a private person. Private detectives usually operate commercially and are licensed. They may be known as private investigators (P.I.s or "private eyes"). Informally, and primarily in fiction, a detective is any unlicensed person who solves crimes, including historical crimes, or looks into records.
In the British police, "Detective" is used as a prefix before all ranks in the Criminal Investigation Department and Special Branch from Constable to Chief Superintendent. Detective Constables do not outrank uniformed Constables, however. In the 19th and early 20th centuries, Detective Constables were usually referred to simply as "Detective", but this is no longer the case. Many Commonwealth countries also use the prefix.
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