Statute law is written law set down by a legislature or other governing authority such as the executive branch of government. This is done in response to a perceived need to elucidate the functioning of government, improve civil order, to codify existing law, or for an individual or company to get special treatment. Additionally to the statutes passed by the national or state legislature, lower authorities or municipalities may also promulgate administrative regulations or municipal ordinances that have the force of law — the process of creating these administrative decrees are generally classified as rulemaking. But these enactments are subordinate to the law of the whole state or nation. However, they are a part of the body of a jurisdiction's statutory law.
Originating as a private bill, private legislation is considered to be a lesser known aspect of statutory law. As for example, it was divorce in Canada prior to the passage of the Divorce Act of 1968. People could get a legislative divorce in Canada by application to the Canadian Senate, which reviewed and investigated petitions for divorce. And then it would be voted upon by the Senate and subsequently made into law. But in the United Kingdom Parliament, private bills were used in the nineteenth century for creating corporations, grant monopolies and give individuals attention to be more fully considered by the parliament.
 There is another term for this law and this is codified law, sometimes used as a synonym for statutory law in general. The entire body of statutory law in some U.S. states is referred to as a "code," such as the Ohio Revised Code or the New Hampshire Revised Statutes Annotated. Moreover, at the federal and state level in the United States, portions of the statutory law are also referred to as "code," such as the U.S. Bankruptcy Code.
But in a more narrow technical sense the term codified law refers to statutes that have been organized by subject matter. And a common example of an uncodified statute in the USA would be the section or sections of an Act of Congress that provides for the effectual date of the Act. As for the substantive provisions of the Act, they could be codified in one or more titles of the United States Code.
A "private law" passed by the U.S. Congress is another example of an "uncodified" statute. This was a law affecting only one person or a small group of persons. Besides, a statute that takes the common law in a certain area of the law and puts it in statute or code form is another meaning of "codified law".
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