Chief executive is a term used for a head of government that allows its holder to perform various functions.
The term can also apply to heads of state as well, though it is less common.
The term may refer to the title of the position, but many constituencies place this power in a position with a different title (e.g., president or prime minister).
Chief executive is a term used for a head of government (e.g., presidential, prime ministerial, or gubernatorial powers) given by a constitution or basic law, which allows its holder to perform various functions that may include implementing policy, supervising the executive branch of government, preparing an executive budget for submission to the legislature, appointing and removing executive officials, vetoing laws, dissolving the legislature, and submitting their own bills to the legislature.
There are a few offices formally styled chief executive: