The term 'DIPLOMAT's Skill' can be summarized as the ability to use TACT. TACT is the ability to be diplomatic and sensitive in dealing with people, especially in difficult situations. It involves being aware of the feelings of others and being able to express oneself in a way that does not offend or hurt them. TACT is an important skill for diplomats, as it allows them to navigate complex international relations without causing offense or escalating tensions.