Consulates are more numerous than diplomatic missions, such as embassies. Ambassadors are posted only in a foreign nation's capital (but exceptionally outside the country, as in the case of a multiple mandate; e.g., a minor power may accredit a single ambassador with several neighbouring states of modest relative importance that are not considered important allies).
A consul general is an official who heads a consulate general and is a consul of the highest rank serving at a particular location. A consul general may also be responsible for consular districts which contain other, subordinate consular offices within a country. The consul general serves as a representative who speaks on behalf of their state in the country where they are located, although ultimate jurisdiction over the right to speak on behalf of a home country within another country belongs to the single ambassador.
Another definition is the leader of the consular section of an embassy. This consul general is a diplomat and a member of the ambassador's country team.
Consul General is abbreviated "CG", and the plural form is 'consuls general'.