Executive Order: An executive order is a directive issued by the President of the United States that manages operations of the federal government. It has similar power to a federal act but does not require approval from Congress.
Statute: A statute is another term for a law enacted by either Congress or state legislatures. Statutes are typically more specific than federal acts and may pertain to certain states rather than the entire country.
Amendment: An amendment refers to changes made to the United States Constitution. Although not technically considered an 'act,' amendments have significant legal weight and may impact existing laws or create new ones.