The terms "ambassador" and "diplomat" are often used interchangeably, but they actually have distinct meanings.
An ambassador is the highest-ranking diplomat who represents a country in a foreign country or at an international organization. Ambassadors are usually appointed by their home country's government and are responsible for representing their country's interests, negotiating with foreign governments, and promoting friendly relations between their home country and the host country.
On the other hand, a diplomat is a government official who engages in diplomatic relations between countries. Diplomats work to promote their country's interests, negotiate treaties and agreements, and participate in international organizations. Diplomats can be of different ranks and hold various titles, such as consul, attaché, or chargé d'affaires.
In summary, while all ambassadors are diplomats, not all diplomats are ambassadors. Ambassadors hold a higher rank and have more responsibilities than other types of diplomats.