Agrément is the formal consent given by a receiving state before a sending state officially appoints an ambassador. No ambassador takes up post without it. The process is routine in stable bilateral relationships and quietly consequential when it is not. What It Is Before a government nominates an ambassador to a foreign post, it privately notifies the intended destination country and requests agrément — French for “agreement” or “approval.” The request is transmitted through diplomatic channels and typically includes a brief biography of the proposed ambassador.

A chargé d’affaires ad interim (often abbreviated CDA or chargé d’affaires a.i.) is the diplomat who temporarily leads an embassy in the absence of the ambassador. The position is common, often unremarkable, and occasionally the most consequential role in the building. What It Is When an ambassador is traveling, recalled for consultations, or when a post is between confirmed ambassadors — a frequent occurrence during political transitions — the senior diplomat remaining at the mission assumes the role of chargé d’affaires ad interim.

A démarche is a formal diplomatic step — a direct approach by one government to another, typically to register an objection, deliver a warning, or press for a specific action. It is one of the most commonly referenced terms in diplomatic reporting and one of the least precisely understood by those who encounter it in news coverage. What It Is The démarche is a tool of active diplomacy rather than passive record-keeping.

A non-paper is an informal diplomatic document used to float ideas, test positions, or advance negotiations without committing a government to the content. It carries no official attribution and creates no formal record in the diplomatic sense. The document exists — but officially, it does not. What It Is Non-papers are the working drafts of international diplomacy. Governments use them when they want to explore whether a proposal might be acceptable to another party before making it formally.

A note verbale is a formal diplomatic communication written in the third person, unsigned, and exchanged between a foreign ministry and a diplomatic mission. Despite its name — French for “verbal note” — it is always a written document. The word “verbal” refers to its historical origin as a written summary of what was once delivered orally by a diplomat. What It Is The note verbale sits in the middle tier of diplomatic correspondence.