Ambassador vs. Envoy vs. Consulate

• An ambassador 
• is the highest ranking diplomat that is sent to another sovereign state in order to represent their country. 
• For example, a diplomat of France in Korea, will represent France, its government and the people of France that reside in Korea.
• An envoy 
• is a diplomatic representative and not considered as a representative of the head of the state. health 
• Source: http://www.differencebetween.info/difference-between-ambassador-and-envoy
• Consulate 
• Consulates are generally under the command of local embassies.
• The consulate carries out non-political issues
• Such as protecting nationals living abroad, promoting friendly trade, supervising domestic aircraft and ships, and administrative tasks for the sending country (e.g. visa issuance). 
• Also handles overseas elections under the supervision of the National Election Commission.
• Protects the status and property of civilians engaged in commerce and industry (e.g., trade) and handling civil complaints and disputes in foreign countries