What do we mean by an annotated code?

Annotated codes are important because they contain not only the text of the various laws (in the code) but they also provide annotations that give information about different legal sources that mention or cite different laws. For example, if you look up 42 U.S.C. § 1983 in the United States Code Annotated, you will find pages upon pages of citations to various judicial opinions that cite, mention, or explain the reach of this particular law. In other words, an annotated code allows a legal researcher to find both an applicable statute and perhaps some citations to cases that explain that statute or law.