Diplomatic Necessity is a term used to describe the need for diplomacy in international relations. It is often used to refer to the need for countries to maintain good relations with each other in order to avoid conflict. The term is closely related to the concept of TACT, which is defined as the ability to deal with people in a sensitive and diplomatic way. TACT is an important part of diplomatic necessity, as it allows countries to communicate effectively and resolve conflicts without resorting to violence.