An ambassador is a person sent by the government of a country to a different country . The ambassador is the official representative of their country . Some countries do not use the term while an ambassador is in the home country , as the office holder is not an ambassador there ; for example , a Canadian ambassador while in Canada is not generally addressed as ambassador , although he or she may be referred to as `` Canadian ambassador to ... '' ; that is , with reference to a specific job function ; the person is addressed or styled as ambassador only while holding such office .